Hello [name]! Thanks for joining the GMC. Before making any posts in the Tech Support forum, can we suggest you read the forum rules? These are simple guidelines that we ask you to follow so that you can get the best help possible for your issue.
I had the same problem. It worked fine until I rearrange some rooms and some folders in the asset browser. I also noticed that my file size dropped from 400+ kb down to 100 kb. I think its corrupted. Luckily, I had backups. I also tried duplicating the problem and wasn't able to.