I just happened across it as I was looking for something else:

http://www.thewitcher.com/patch1-35/

Changelog:

* Issue with shadows in 3D Vision mode has been resolved.
* Screenshots to savegames made in 3D Vision are now visible in load menu.
* Issue with Steam achievements not being registered has been resolved.
* Blood texture glitches in game with ubersampling option turned on have been fixed.
* Pocket item counter is properly updated after picking up an item which is already selected.
* Issue with ingredient counter when brewing multiple Thunderbolt potions has been resolved.
* Finished “Scent of incencse” quest is no longer marked as failed when entering Loredo’s residence at the end of Chapter 1.
* Corrections have been made in the greater mutagen drop rate.
* Deleting savegame after entering memories and flashbacks menu no longer causes “Loading available flashbacks” message to appear.
* Game exe files are no longer treated as a threat by popular antivirus software.
* Patching the game automatically right after installation no longer causes Launcher.exe error on Windows XP systems.
* Game installation folder is not recognized if diacritic signs were used in folder name on Windows which doesn’t support them. Patch now properly informs about the cause of the problem.
* Name of two scientists in Flotsam have been corrected.
* Storage chest description have been corrected.
* Description of Mahakaman Rune Sihill imported from The Witcher savegame have been corrected.

Also available when you check The Witcher 2 under My Account.

What was the error?

Yeah, I installed the hotfix and then...

The options in the main menu are MENUNEW, MENULOAD, MENUEXIT.
When dialogues start, the active character stares at the other, then the other character which was supposed to speak stares at the other character.

This patch screwed things up totally. (I installed it for the box Polish version).

Something with the patching process went wrong - the patch itself is fine. Maybe you accidentally downloaded the Japanese version of the patch? It isn't marked as that on the download page.

Try running the (correct) patch again. If it doesn't help, I'm afraid you'll have to reinstall the game.

That's pretty bad. Maybe try the full 1.0 to 1.35 patch to see if that fixes things.

Nah, it turns out I can't read. Or something in the description of the patches is not so clear.

There are two patches 1.3 -> 1.35 on the WItcher 2 site, I downloaded and installed the wrong one. It seems that the one I installed was for the Japanese version (not that it's described anywhere...)

I think it's messed up, as the icon doesn't say it's Japanese, yet the file name has JP in it.

The multilanguage one is the first 1.3-1.35 on the bottom left, and it's about twice the size at 72 MB.

The tool tip of the sword read something like "MAHAKAN RUNE IMPORT SWORD 1234" or soemthing silly like that.

I think I know why I missed that: I played through the game with version 1.0 (and later upgraded to 1.1 while still on the same run), so the Mahakan Rune Sihil never got imported. My second playthrough with v1.3 started just a day ago and I hadn't yet checked the tooltipp. ^^

Thanks for the information.