I was working on the model… the entire screen went blank (black!)…
I tried to re-open the file from Trimble… it asked if I should save… I said yes…
It now has NO contents in the file. sigh
Other instructions on this forum explain how to go to Trimble connect, select check-box near file, and right click to version history.
But there is NO CHECK-BOX near the filename. 
Is there any way to recover my work?
if you open the file and press the spacebar (for select tool) then Ctrl-A, followed by Shift Z, do you see something popup, then?
Turns out that during the error condition… all layers got set to hidden… [and I had no objects on layer0]
Using layers, turning vis on for each resolved issue.
Turned out to be layers off.
Q: but is there a version history feature for the web version or is that not available?
