Are you saying that you cant open CBP 9.5 at all? As in double-click CBP 9.5 icon >splash logo shows > CRASH… > desktop. Is this the sequence of events?
Frankly i have not experience this. However, i believe it may not be possible what you are describing (not doubting rather do not really understand the issue you’ve described). From what i can vaguely remember is that if the UR 44 is not connected, the dspMixFx does not show up… again on my end this step was not tested on my end.
The other solution is if all else fails change a different USB port. Just rem to use a USB 2.0 port.
Also if necessary, trash the CBP preferences and re-do all VST settings.
hope this helps…