Thanks, Yes, it is networked. I think even the 'C:' drive is actually a virtual onedrive c. Fails both on desktop and network sites.
I suspect that it is network issues, but wanted to check if I had missed anything on the CAD side of things. Trying to think today what updates they did recently, there was a BIM360 / desktop connector one I think - but these are not on the AutoDesk drives, and I think there was a Windows one so might have been that.
Anyway - IT is looking at it 'Urgently' (for the last 7 hours.... (Overseas IT department))