In fact I have 2 problems, the 1st one causes the 2nd one
1.
I recognized, that when I change tags to a huge amount of files (> 50) with the "Replace String" addon, sometimes not all mp3-tags are changed too (though I have the "Update tags when editing properties" and "Modify timestamp when updating tags" options active) - is this a known issue?
... but more important is the 2nd issue:
Due to this issue for some files the entries in my db are not egual to the corresponding files.
Example:
From time to time I correct "articles" before band names (e.g. changing all "The Rolling Stones" to "Rolling Stones").
Due to some changes were not written to my tags, I know have some files tagged with "The Rolling Stones" in my library, for whom MM has already "Rolling Stones" in the db. So ... I cannot find them (using MM) to correct.
The "Add/Rescan files to the library" option does not help, for it only sees files if the timestamp has changed (and for the changes have been written only to the db and not to my files, there is still the "old" timestamp).
Is there anyway to synchronize or "check" / compare the tags to / with MM 5 db or is the only way to delete the whole db and "start anew"?
Thanks