I found a problem by converting the title of a file.
I selected the "Tag - Tag" translation via the right mouse click.
and select "TITEL" from the combo box.
to set a sequence of a album with...
this will not work!
I've to change the word "TITEL" to "TITLE"
only this will work! And the modification got lost if I try it again.
This is just a minor bug, but may it can be solved in one of the next versions.