Always when I try to create a new level (default or empty) or when I try to save or open a level explicitly the whole editor crashes. This happens with my current project. The project can be started normally.
I think that the system crashes when I try to save (which also happens on switching levels I suppose) with the problems described in the other bug report.
I’ve added some logs and my dxdiag file to the attachments. I hope this is what you have requested.
We have not heard from you in several days. I am marking this as answered for tracking purposes. If you are still experiencing this error, please comment with the requested information.