I'm able to reproduce under certain circumstances as well: http://www.ventismedia.com/mantis/view.php?id=11413

[quote="Friedrich"]The confirmation dialog occurs twice when editing properties of a larger number of tracks.
How to reproduce:
-Select a larger amount of files (50+?)
-Change properties (here: genre) by
a. Drag & Drop in the (genre) node in the media tree to a different property (genre)
b. Editing in the properties window (here it seemingly does not always occur)[/quote]
Although I have had no problems with the property window (that is what i use and with large number of files just yesterday) I just tried the drag and drop method with 600 files and it did prompt twice. So should be easy bug for MM to confirm.

The confirmation dialog occurs twice when editing properties of a larger number of tracks.
How to reproduce:
-Select a larger amount of files (50+?)
-Change properties (here: genre) by
a. Drag & Drop in the (genre) node in the media tree to a different property (genre)
b. Editing in the properties window (here it seemingly does not always occur)