I know it has plenty of issues (losing the download queue when re-started, etc...) and I have experienced most of them but, at least on my PC (Seven 64), I don't seem to have the reorder drag and drop issue you describe. (the status refresh is working too)
When it comes back, any hope to have it work even if the downloader is no running ? (i.e. you can add games to your download queue from anywhere and have them being downloaded the next time you start the downloader)

[EDIT: after 2 days of these problems, everything seems to run fine now, probably it was a server issue / screwed API calls ]

[EDIT2: spoke too soon, behaviour is erratic, some downloads work, some go on with the same bad behaviour explained below: just plain ridicolous....]

Agreed on the "completely broken": after the update I have been unable to download even a single game via the downloader.
Problems seen (various kinds all together, never ever experienced with the previous version):
+first download stuck at 0%
+download deleted but still going on (..!), therefore keeping apparently stuck all the others (took a while to find out!)
+ left the "ghost" download end, others started, all giving checksum corrupted in chunk 0
+ in many occasions clicking on the website doesn't even queue up the download
+ tried everything, like clean/remove the list, reboot, uninstall downloader and reinstall, nothing changes

Please fix this ASAP, thanks!

Specs:
Downloader version: 3.2.7.0 (stable)
Win 7 HP, x64 / ITA
Firefox 16.0.1

Log snippet follows:
1350743395 Downloader 0 Downloading chunk phantasmagoria_wallpaper.zip.0
Expected starting bytes 0, ending bytes 7283996 for chunk phantasmagoria_wallpaper.zip.0
Starting bytes 0, ending bytes 7283996 for chunk phantasmagoria_wallpaper.zip.0
1350743413 Downloader 4 Ended downloading chunk setup_phantasmagoria.exe.4
1350743414 Invalid checksum on chunk setup_phantasmagoria.exe.4
1502561319 size on chunk setup_phantasmagoria.exe.4
1350743419 Downloader 2 Ended downloading chunk setup_phantasmagoria.exe.2
1350743419 Invalid checksum on chunk setup_phantasmagoria.exe.2
1502561319 size on chunk setup_phantasmagoria.exe.2
1350743439 Downloader 0 Ended downloading chunk phantasmagoria_wallpaper.zip.0
1350743439 valid checksum on chunk phantasmagoria_wallpaper.zip.0
1350743439 Resetting cache
1350743439 Resetting cache
1350743440 Cleaning completed download Phantasmagoria
1350743440 Cleaning ended
1350743441 Cleaning completed download Phantasmagoria
1350743441 Cleaning ended
1350743466 Downloader 5 Ended downloading chunk setup_phantasmagoria.exe.5
1350743466 Invalid checksum on chunk setup_phantasmagoria.exe.5
1502561319 size on chunk setup_phantasmagoria.exe.5
1350743523 Downloader 3 Ended downloading chunk setup_phantasmagoria.exe.3
1350743523 Invalid checksum on chunk setup_phantasmagoria.exe.3
1502561319 size on chunk setup_phantasmagoria.exe.3
1350743543 Downloader 0 Ended downloading chunk setup_phantasmagoria.exe.6
1350743543 Invalid checksum on chunk setup_phantasmagoria.exe.6
1502561319 size on chunk setup_phantasmagoria.exe.6
1350743570 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350743571 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350743750 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350743751 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350743930 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350743931 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350744110 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350744111 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350744290 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350744291 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350744470 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350744474 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350744650 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350744651 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350744830 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350744831 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350745010 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745011 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350745190 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745191 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350745370 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745371 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350745550 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745551 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
Clicked URL: gogdownloader://kingdom_the_far_reaches/win_installer
1350745730 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745731 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
Clicked URL: gogdownloader://kingdom_the_far_reaches/win_installer
Clicked URL: gogdownloader://kingdom_the_far_reaches/win_installer
1350745910 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350745912 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7
1350746090 Worker -1 Requesting https://api.gog.com/en/downloader2/user/stable/
1350746092 Worker -1 Requesting https://api.gog.com/en/downloader2/status/stable/3.2.7https://api.gog.com/en/downloader2/status/stable/3.2.7

I am able to put items in the queue for download but is shows no progress unless I click "Pause" and "resume all". The other items in the queue say paused even though I hit resume all. I tried deleting the log and it did nothing to help fix it. Edit. Just tried uninstalling, deleting the log and games, then reinstalled. It works now.
Edit.
Never mind, Just popped up with an error telling me to check the log.

Looks like they repaired download additional content feature. Other bugs still present. I just don't get it. After first problems with new downloader GOG took proper path: split downloader to stable and beta versions to introduce fixes&new features to beta first to...eeee test it and after that -put in stable version. But we didn't have any beta update for months...and out of the blue we all got MANDATORY update to new, 'stable' version.

Apparently there is sth wrong with GOG's internal testing procedures...Why GOG just not invite say 250 of us to test new version? Why were we not warned that new version gives up chunks and if you are in the middle of downloading game you will have to start from the beginning?

EDIT: And just one word for web developement team: fix those paragraphs, please.

So, I've used about 4 days worth of bandwidth trying to download IWD with no luck, the GOG downloader says it is done, but to no avail, the download is definitely not complete.

I would try and use another downloader, but of course the site won't let you use a 3rd party download manager and it will download for about 10 minutes before kicking off and not having any way to resume...

You can use browser to download.
There are some alternative downloaders written by community members.
http://www.gogwiki.com/wiki/Download_Clients

My downloader behaves strangely also. It downloads nice and fast, but for some reason it starts the installer twice each time.. tried with about 8 interplay titles today and it happens with each of them.

Thanks!

I'll try one of the other downloaders, problem is with the browser is I disconnect a lot, but with the way satellite internet works here in Afghanistan, it is not the most dependable way of downloading then resuming when I get interrupted

Yeah, I updated to the beta version months ago because the regular version didn't work for me at all. The new version seems to be horribly broken and with a non-intuitive interface.

Apparently the drag and drop system was change drastically without any particular warning. If you want to reorder games, you have to click and drag the icon, if you click on the individual items they only let you prioritize them with respect to that game. Which means that if you just want to download the small bonus content first and still have the other items in your queue, that you can't do it.

Intuitively it makes no sense at all, and I'm not really sure why that change was made. But it looks like the other things are now fixed.
Apparently, it's "working" for me as well, it's just that the UI is completely unintuitive. If you click the individual item you can only reorder with respect to other downloads for that game. If you want to reorder the game, you have to click on the icon itself, but then you can't reorder it so that you download all the games before all the content without adding the content later after all the games are finished downloading.

And I don't see any hints in the UI to suggest that I should do that.

I do not use the Downloader when downloading my GOG games. I download each individual file by just clicking on it. I've tried downloading Legend of Grimrock, The Witcher, and Alan Wake...and every one of them said that there were corrupted files. I am not really sure if it's GOG that is the problem on that, though, as it's a new computer rig and other games outside of GOG (Guild Wars 2, League of Legends) have been crashing alongside Flash through Google Chrome.

Any word from GOG when the downloader will be fixed? Browser-based downloading isn't viable for some of us, so, for the moment, I can't access the games on my shelf. I really would like to use an older, non-broken version of the downloader.

Is it possible to downgrade from 3.2.7.0 until they fix it? If so where can we get the old downloader?

Unfortunatly (for what i know) , it's not possible .. .

Even so , u manage to get your hand on the prevous version , u'll be prompted to install the buggy version ./

ATM , "workarounds" i know is either going through the browser or by trying one of the others downloader (see the wiki , the link was provided in a post above).

If u want to try , with the 3.0.52 , i have still have it on my NAS (so i could eventually upload it later somewhere)

Well the latest version of the downloader (3.2.70) is not working properly for me. It seems to be impossible to download a game as I am losing MB's by the second. Can you please bring back the old method where the downloads were parted in chunk files and then merged when the downloading completed? That worked pretty well for me.

I am using Windows 7.