Hi everyone.
I am facing the same issue between Rig Manager and Rack KPA since the last update to RM 3.4.32 and Profiler OS 9.0.5.
I tested on different PC USB outputs and reinstalled Rig Manager several times.
Then the connection was re-established after reinstalling RM again!
But I lost it after rebooting the PC and found it again on next restart...
I'm using a 4m long USB cable and I believe the problem is on its side (I'm waiting to receive a new, shorter one...).
This latest update increases the data load on this USB2 output, which may be reaching its limits.
If you have one, try a shorter, better-quality cable.