Editors Save Empty File ( 0kb )

This just started today...

Connect to server using SFTP
Click Edit on File - Internal Editor Loads
Click Save and the file posted to server is 0kb

I've confirmed that the file is being downloaded into the temp directory satisfactory.

** Found Problem - Disk Quota Exceeded on Server
** No Error Reported by SCP that File was not saved..

The error, if any, should apper in background transfer queue list.
Can you post a log file?