I am receiving the following errors on my CUPC client:
* Device Error. Could not connect to Device Provider. 
* A device initialization error has occurred. Could not connect to Device Provider. 
I have ensured that the CCMCIP setting is in place as posted in this thread: https://supportforums.cisco.com/thread/2093573
I also set the Registry Key and checked the Certificate Expiration as suggested in this thread: https://supportforums.cisco.com/thread/2030254
Still no dice. Other users are working with CUPC 8.x clients without issue (somehow even without the CCMCIP setting). My CUPC client shows when I am on the phone, so that piece is working. My phone has my user ID associated with it, and my User ID has my phone as a CTI controlled device. My device has CTI control allowed, and my User ID is in the Standard CTI group. Not sure what else I am missing.
Also, I tend to NOT use IT accounts for just that reason. Someone is always messing around with it and turns it is not the same as other accounts…
It starts to make sense to me now Can you tell me if your userid has any upper case letters ?
ie Josh.Anderson instead of josh.anderson ?
If yes, can you try to login to CUPC using the exact same username as it appears in callmanager ?