Are you working single-screen or in the new dual-screen mode? And are you opening the project from the File menu, or through Windows Explorer? We have some fixes waiting to go into the next patch 13.0.2 but I wanted to check if they might cover your particular problem.
Okay, we do have some fixes in this area for the next patch which is being prepared now, I would expect it to be released in the next day or two. If you still have problems after that, please email support with the details and we will investigate.