I installed and started playing this gem of a game last night, and was making great progress in the first campaign. I then eventually quit after having played an hour or two, and went to bed. Now when I start up the game, there are no savegames present when I choose 'Load Singleplayer Game' anymore, and lord knows what has happened.
Any help is welcome.
-Kindo

If I remember correctly, using certain characters in your profile name prevents the game from saving properly. That's about the only thing that springs to mind at the moment, though.

It's possible if you're running in vista, using "run as administrator" and just running normally will give you two different save directories. try both and see if there's a difference.

I can only find the directory inside the game folder (Giants/savegame). Where might the other be?

That's common with all issues that prevent the game from saving properly - everything will look fine before you quit, but once you've started the game back up it will all be gone.
And yeah, I'd forgotten all about Vista - it's fairly likely that it's playing a hand in all this.

Accursed Vista!
While I didn't find any errant savefiles in around the path you directed me to, I have managed to get saves to work if I right-click the game program and choose 'run as administrator' (I pasted in a save file from another user here, who had reached about the same chapter). So I guess that kind of solves it, but I bet there's a way to allow the file to be run with administrator privileges more permanently. Thanks, though. I can get back to the game now, at least. :)

there is a way to do it, sign in as the administrator and turn off user account controls.

Yes, I am aware, but the weird thing is that it's been disabled since I first started using Vista (the most apparent annoyance of the OS). I'll see if something might have gone wrong as I was fiddling in the registry while solving other problems.