We are getting this exact error suddenly. How do I determine if we have received this patch? We currently have version 7.6.2.9999. When I run update client, says no new updates.

The system is running Windows 10 1803 and started suddenly when running 1703 a week ago, so I updated to 1803 and its still an issue. Randomly our system stops sending emails and we get the same error in logs:
Error creating temp file: (267) The directory name is invalid.

A reboot will clear it up for a short time, maybe a day. I doubt its a permissions issue since a reboot resolved the problem temporarily. But the perms are correct regardless.

I tried disabling the task for DiskCleanup, still have the problem.

I appreciate any help,
Greg