Recently on a terminal server environment, we have a few users getting black screen on logins. The terminal server used User Profile Disks so I thought it could be corruption.

Checking the Terminal Server Event log had a lot of NTFS 50,51,140 and 137 Errors.

When the profile would eventually load Outlook would come up with “ost is not valid”

Logging into the File sharing that shared the UPD’s and it showed that the UPD disk hosting the files was full up and someone had not added it to monitoring!