Not questioning your experience Ben, just trying to be helpful.  Unless you need FSUPC for your game controllers, you can remove it and PMDG could care less. All I use it for is telling me how much VAS memory I have remaining and a low memory alarm. Other than that nada.

I use it for the Flight Controls due to Windows 8 Joystick disconnections. 

Did you ever find a fix for this? I am experiencing this exact same issue.

Did you ever find a fix for this? I am experiencing this exact same issue.

This is not a good way to find solutions to an old post, if you had quoted a thread then the poster may have received notification of an update, maybe.

 

Also, please note that full names are required on all posts in the PMDG forums.

 

There are many different reasons for FSX freezes, even the definition of what constitutes a freeze varies. Best if you explained your problem in a new thread, and any steps you've taken to resolve it.

In FSUIPC on the autosave tab. take the check marks out of the polling. this should fix the freezing.