Hello,
now I eventually updated to PellesC 4.5 Beta, but the IDE startup seems pretty unstable. Whenever I wanna use the IDE, I might have to try to start it 10 times until it doesn't crash immediately and stay working. Then working is no problem anymore. But then randomly the compiler gives error 42 (I believe it was) and doesn't tell me what's wrong. In fact, on a second attempt to compile it works just fine.
I do know that this is the Beta. But I didn't find anyone reporting this issue one the forum. By the way, it's WinXP SP2.