Build has strange behaviour

Hi!

My game works perfectly in editor. When I make a build of it, it works fine the first time. After that when I run it again, changing ingame data (number of players) has no effect. If I build it again, even the first run fails the same way. If I make changes to the scripts and build it, the first build works again and the runs after that do not.

At some point I deleted temporary data and stuff that Unity can compile again. It didn’t help. I’m suspecting something that has to do with folder permissions but I’m not sure.

Oh, and this is a project migrated from 3.6 to 4.0. Does that matter?

Thanks in advance!

Oh, and I’m not sure if this is relevant but I updated from Windows 7 to 8 between working on the project. The menu that doesn’t quite work did not exist before update.