Yes, the MPVI-1 no comms and MPVI-1 invalid app key issues both have the same root cause. If your MPVI is still plugged in, be sure to unplug both ends before trying it again with the latest software update.
There is also a less common issue where VCM Editor may have crashed at startup or upon loading a tune file... That issue could have several causes, but this is one of them, so it's potentially fixed by this update as well.