Which Build (Help > About) of MediaMonkey are you using, how many files are in All files, and are you attempting to Play Now prior to All Files having finished loading?

I was unable to replicate on the latest 2024.2 beta.

This latest bug is repeatable. I load MM2024, the latest as of today. Then go to the column on the far left, down to music, all files, right click, and play now, and crashes every time. I did the same with FxSound, running it hard crashed had to hard reset. Hasen't done that again, but I'll keep testing. laptop, Thunderbolt docks, USB sound blaster X3, Windows 11, 16gig memory. Sometimes it tells me out of memory. I think my browser has a memory leak.