Alt+Tab sometimes works. MediaMonkey 5 manages this much better for me.

More Information: I have a docking station that attaches a second monitor. Taking the computer off the docking station, rebooting, then attempting to update the library operates as normal. Following return to the docking station, the problem is no longer evident. (Hey, I had already rebooted the PC and the docking station w/ no change!)

The issue appears to be resolved, but is there a way to bring the dialog box to where I can interact with it when it does this? I tried WIN/SPACE-M, and a couple other things w/ no joy.

When I click on "update library," the whole MMW window locks up. I can't manipulate it at all: move, minimize, maximize, close all return a tone as if there's a dialog box open I need to pay attention to, but I can't find the dialog box.

Windows Task Manager reports very little resource utilization across the PC, and I can end the MMW task easily.

Running MMW 4.1.31.1919 on Windows 10.0.19041. 32GB RAM, 2TB SSD.