Actually Drag & Drop asks for confirmation.

Just to confirm - so you can click one place, or drag something and move 40k files from 6k folders into one folder without any confirmation?
Wow. Even file managers cannot do that so easily lol

And Auto-Organizer was off, and is off, and cannot save nor fix it (meaning put each file back into folder from which it was taken)

MediaMonkey won't move files on its own. It requires enabling Auto-Organize. Otherwise it's a user action that will move the files. As mentioned Auto-Organize Files can likely fix the issue by moving/renaming files based on the tags in the files.

Well I did not turn on Auto-organizer, and I did not drug files (I have 40k files spread in well organized folders and its actually scary to think you can move all files from those folders into one folder by misclick or mis-drag).
Anyways, I really like software but alas need to look for alternative again ...

You may have set Auto-Organize or maybe Drag & Dropped folder/files in the Location/My Computer node.

Tools > Auto-Organize Files may be able to fix this.

So today i have open the MediaMonkey program and i realized there was a lag while running a program.
Than i realized that all my files which were nicely organized in folders and years they were added got moved to a folder M:\music ....
Now i have like 300 gb of files there all dumb there outside of folders ....

Anyone has a clue whats happened????