I checked the event logs on my PC, and as 1Sascha says, it looks like the launcher is crashing BG3 with a .net error. This is rather curious, becuase I start the game without the launcher, and I've checked - when the game starts, there is no launcher in the process list. I have no idea why the launcher suddenly makes an appearence, so I went and renamed it. So far, after about one hour of playing, no crashes. Then again, I've been working in IT long enough to know that this is not yet significant... ;-)