I'm STILL having this happen myself...
There's nothing to log - one minute you can use shortcut keys, the next nothing.
Restarting the application restores them.
I've been unable to reproduce it at will like the OP - however it's as though whatever allows you to use keyboard shortcuts (such as alt-enter to get to the properties, ctrl-r to reorganize, etc.) are all disabled.
I've had it "reenable" once randomly, too - no clue what did it though since I was finishing up a few edits before bed and then hit a shortcut out of habit and it worked.
Just to let everyone know.... this is still a thing.
Edit: This was also brought up here: https://www.mediamonkey.com/forum/viewt ... =1&t=83018