I noticed that inline tag editing of a single MP3 track is not saved althought MP3Tag it confirms it. This happens in version 2.45a and 2.45b
1. Load a list of MP3
2. Choose one track
3. Choose a tag to edit
4. Double click - slowly - on the tag to enter inline editing mode
5. Edit the tag
6. Don't click anything else and leave the cursor blinking inside the input field
7. Click the Save button
MP3Tag will report that the tag was correctly saved but as you will notice the edited tag is restored to the old tag.
When edited the choosen tag user must click on an other track and then click the Save button.