Please capture the crashes in a debug log (step 4b) and attach the log to a Support Ticket: viewtopic.php?t=86643

This will help a developer analyze why this happens on your setup.

Thank you. I'll try copying the entire %Appdata%/Mediamonkey5/ folder.

The most important infos (besides the database) are in the Mediamonkey.ini and persistent.json. Thumbs are in the folders Thumbs and VideoThumbnails.
These are all in the Portable subfolder for a portable version, or in %Appdata%/Mediamonkey5/ for an installation.
I synchronize the above data regularly between the PCs to have the same settings everywhere.

Hello.
Long time MediaMonkey Gold user here.

Ever since I've upgraded to MM5 I've been getting random crashes on startup almost every day. There's no LOG ID or any information; just a couple of buttons to "restart" "retry" or "ignore". Only restart works, so I usually press that. However, sometimes after restart, MM5 completely resets all of it's preferences to default: skins, settings, hotkeys, playback preferences, window sizes, custom columns and views, everything gone!

I have already configured the app 4 times from scratch since I upgraded to MM5 and I must have wasted a good couple of hours repeating this process. This never happened with MM4; which was very stable. I love MediaMonkey but I'm sad to say that I'm starting to regret the upgrade...

So how can I backup MM5's preference files? Where are they located?
I want to copy those files somewhere else so that when this problem happens again I can just copy-paste everything back again.