Hi ponaelius,
This could be caused by a corrupted element or database connecting to your project.
What I would try:
1. Ask all users to send data
2. Save a .pln from a user's machine where you still can Receive
3. Open the project with 'Open & Repair'
4. Re-share the project to the server
If it doesn't help, I would suggest to contact your local GRAPHISOFT Partner or send me a private message and we will try to sort this out.
Kind regards,
Noémi
Noémi Balogh
Community Expert, Admin