(I'm adding this comment to many bugs that this fix might apply to...sorry if you see it multiple times or it doesn't _actually_ fix your issue.)
Here is a new test build, please try it and report back. It's a 2.1 megabyte
download, so you don't have to redownload the whole game again.
This is meant to fix crash bugs mostly. We still have rendering issues, etc to sort out. If this didn't fix your issue, please report it on this bug. If there are still other unrelated issues, please file a new bug or add yourself to the CC list of one of the other bugs. Here's the open bug list if you want to check for others with the same problem:
https://bugzilla.icculus.org/buglist.cgi?query_format=specific&bug_status=__open__&product=Psychonauts
Steam users: you'll get this through Steam shortly.
Linux users, download this...
http://treefort.icculus.org/psychonauts/psychonauts-linux-0.3-patch.tar.bz2
...and unpack it. Overwrite Psychonauts and libSDL-1.2.so.0 with it. This works with either of the first two builds from HumbleBundle.com.
Mac users that aren't using Steam, download this...
http://treefort.icculus.org/psychonauts/psychonauts-mac-0.3-patch.tar.bz2
...double click it, and run the patcher program it produces.
We'll do a more formal build once we get some feedback.
--ryan.
Created attachment 3165 [details] Crash log This is with the recent patched version.
Created attachment 3168 [details] Another similar crash