I was about to tag a file in the side pane. I clicked in the name field, and before I could type something, I noticed that the name changed to [Varies], and the bottom task bar now says "115 Files (8:01:08 - 3.2 GB)", which about correlates to the artist that I had selected to get to this file. I noticed something similiar earlier when I right clicked on a file, the right click menu "went away" if I didn't pick something within about 5 seconds. I'm currently running a bunch of MCWS commands against the server, but I wouldn't expect that to cause an issue. The MCWS commands are Library/Import?Block=1, File/Search, and File/SetInfo.
I can validate this after the python script I have is done doing it's thing (that my focus doesn't change). Is there anything in those MCWS commands that I should do differently (if it is in fact interrupting the GUI)? I almost retagged 3.2GB of files by mistake.