USB Scanner attached Windows 2008 Terminalserver works for one user, not for another

Hi Experts,

I have a Windows 2008 Terminalserver. Attached to that is a USB document scanner. Drivers are available and installed, the device is visible in device manager. There is one program installed on the server that is supposed to use the scanner's TWAIN interface to scan documents.

Now, here's the funny part: Most users on that terminal server can start the program and it recognizes the WIA source and can scan just fine. Only for one user that program does not see any available scanner sources. So I figure it must be some issue in that user's profile, but haven't found anything about scanners in the HKCU-section.

Note: I have written the program that should scan myself. It's a relatively simple VB application and does nothing overly exciting when listing all available scanner sources. If it works for one user, it should work for all others, too...

Do you have any idea what could make Windows 2008 behave in such a weird way?

Thank you and best regards,
Who is Participating?
jrhelgesonConnect With a Mentor Commented:
Are there any entries/error messages in the event log? Failing that, I'd download and run MS Sysinternals "Process Monitor"

I'd monitor file, system and registry activity and compare the results with a working profile.  That should get you pointing in the right direction on where to troubleshoot.
StaudteAuthor Commented:
Thanks for the kick in the butt.... should've thought of that myself ;-)

Indeed, there's a problem with c:\user\faultyuser\windows\twunk_16.exe that can't be started. I'm pretty sure that I just need to delete that file. Don't have time for an in depth-test, but that looks quite promising. I'll check it later and get back to you.

StaudteAuthor Commented:
Yep, couldn't wait and tested it right away. There were a bunch of TWAIN-related files in the faulty user's Windows directory, none of them were in the working user's one. I removed them all and now it works just fine!

Thanks a lot for the pointer and have a great year!

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