Alright. Here is the solution. Subscribe to this, in case you ever need it.
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.
a. The check in will generate a current version of ‘UNDDACAD.ac$’ (you may want to verify the new date).
Chris mentioned this, but did not mention the part about stopping and restarting the IIS server. Thanks to everyone who tried to help me with this. I owe you all beer or donuts.
Beer , but donuts good too
Glad you found a solution!
I have several users having the same problem as described. Any dwg file either created from Autodesk Inventor 2014 or AutoCAD 2014... doesn't matter. The Vault will not check these files in.
Did you try the marked solution listed above?