Great news, MiPi!!!
Thank you for your advice regarding persistent.json

Found the bug, it will be fixed in the next build.

Thanks for description, bug reports received, I will look at it. Btw. when you get into similar troubles, you could kill MediaMonkey processes from Windows task manager and then remove/rename "persistent.json" file (for portable installations in Portable folder), this will force MM to start to default view.

While in Playing window, when MM5 is showing artist images along with the music playing, some artist causes a crash with an "Uncaught Error: "Cannot set property 'images. of undefined"" cryptical message.

Some error reports follows:
ID A04CCF00

After the crash, is difficult to restore normal operation, since MM starts from the last screen that was in use, and the crash is produced again.