This sounds pretty weird. I dont use performances so I cant say it works for me. Profile editing works all the time.
I have seen many PCs that have USB 3.0 ports that dont run correctly with 2.0.
I think Kemper also suggests connecting the Kemper directly to the PC in use. No hubs, etc.
PS: If you ever run into a person who created USB 3.0, kick them square in the junk for me.
Its been 4 yrs of weird hahaha. I mostly only use it to create setlists for gigs (using Performances). Maybe its just the performances and updating/communicating to the profiler is the issue, or an issue on the firmware side. And its not just me, my buddy has the same issues, so its not my Kemper either. I have both a Mac and Windows laptop, and have issues on both (Mac more to be honest). Everything else I do on the profiler itself. Even yesterday I couldn't drag and drop the performances from local to MyProfiler. That used to work.... I don't know what happened. I gave up after an hour of screwing around. Will try again over the weekend.