1. On all ADMS’, examine the content of the ‘C:\Windows\Temp’ directory for ‘UNDDACAD.ac$’.
2. Check the file date. If it is much older than the installation date (or if you want to test this), proceed…
3. Invoke IISRESET /STOP.
4. Move ‘UNDDACAD.ac$’ out of the ‘C:\Windows\Temp’ directory.
5. Invoke IISRESET /START.
6. Test DWG check in.