Likely Archicad is running into an issue while trying to redraw the view. It can be due to some corrupted elements (stairs, railings for example), or there can be a problem even with the local cache. Depending on how many members are affected, it worth to start with a re-join / reload from server to clean the local cache then if it still occurs, save a PLN, open & repair and re-share this project.
It is possible that none of this will work, but then I suggest to collect a Support Package and the crash IDs and send it to your local technical support, so they can investigate it and help you fix the problem.
Noémi Balogh
Community Expert, Admin
