OK, I started a new save, which I can now load without problems both before and after restarting D:OS - and the new save folder is also marked as "Read-only," so that's apparently not the problem. I guess the earlier Win7 BSOD crash somehow corrupted the old save?
It's pretty frustrating, since I didn't experience such crashes with any alpha version, and I don't want to spend too much time in the beta if I'm just going to end up corrupting all my save files like this later on.
Last edited by Mikus; 04/04/14 08:34 AM.