Not allowing to save

I have a commercial licence for rhino for mac and of late it wont let me save files, it will say autosave failed and when I manually click save it pops up with a window saying " could not save rhino document’
iv done all the usual things like restart, make a new file etc etc. but it is still doing it, and there is no save as option on rhino mac?
help would be great,

Where are you trying to save the file? Are you trying to save to iCloud?

To Save As, hold down the option key before clicking on the File menu and the Save As option will appear.

ow great, thanks.
yer im saving to a server, although i dont have trouble saving any other files just rhino