I asked Wandering Falcon if the SpaceChem demo (or space chem itself) ran, and it turned out it had the same problem.
This is significant because SpaceChem happens to use the same graphics bindings as Proteus.
So, a bit of research into that problem showed a couple of options:http://forums.steampowered.com/forums/showthread.php?t=2820586
- In this case, reinstalling video drivers fixed it (also has some info about Process monitor, so I'm going to look into that and make sure I understand how to run it on my PC before suggesting it, but feel free to try that and post results if you find anything)http://forums.steampowered.com/forums/showthread.php?p=29641921
- Seem to be a couple of options here:
- "i had this problem. fixed it by going into the games folder in steamapps\common and deleting 92800_install.vdf"
- "Ah Fixed on my computer! I had to change the comparability settings on the SpaceChem.exe (running on Win7) to Disable the Visual, desktop composition, and high DPI."
Let me know if any of these fix it, and I'll keep this updated. I'll also check out that Process Monitor mentioned above.
Thanks for your patience with this! It's a nightmare tracking down these odd 1-in-1000 problems when you've only got a couple of PCs to test on.