... Exntended Tags when multiple tracks are selected. Just one ARTIST appears. When a single track is selected e.g. two ARTISTs appear.
Yup, but the value shows which basically means that both values are kept. This is how it works at the moment and is not a bug.
Well, that /is/ what I'm reporting!
Suggestion: Since this makes it rather hard (i.e. impossible) to view or edit either value, please show the values individually, as in the single-track case.
Yes, sounds good to me (at least for fields whose values are the same in all selected files).
Multiple values are now shown with the latest Development Build Mp3tag v2.41a.
Confirmed in V2.41b. Excellent - thanks!