Totay I've been tagging my music. While playing with mpc files, I/he noticed very strange behaviour:

1. Right click on file and select Edit tags for this file. All tags are filed right.
2. Click next in tag editor - and all tags gone
3. Click "edit tags for this file" from right click menu in above file, and again - tags are visible.

It took me some time to figure out, that:

1. Amarok can't save tags in mpc files, so only saves them in database.
2. Clicking "edit tags for this file" reads tags form database.
3. Clicking "next" reads tags from file.


I think that best solution would be that Amarok has support to save tags in all weird files like mpc & firends
But, I would be happy, even if it will tell, that file has weird format and it will only save tags in database.