I'm trying to save a sheet template I just made, and I get this error message.  What do I do?  I also can't save any other files right now.  "An unknown error has occurred". 

Are they trying to come up with the least helpful error messages ever?

I was just on the phone with a customer getting dimensions for a model.  I don't want to have to call him back because I can't save my work.  Anybody have any ideas?