When I first downloaded and installed Mp3tag, early 2.6 version I believe, when I went to add a cover by right clicking in the cover art area in the tag panel the dialog that popped up always defaulted to what I believe is considered the current working directory, the one that was scanned, instead of the directory that the file/files being edited are in. This led to extra work in browsing to the appropriate folder which isn't bad if one is updating a few files.
At some point I upgraded to version 2.66 and when I went to add cover art the dialog box would default to the folder that the mp3 file/files being edited were in which made the process much easier. About a week ago I reformatted my computer to start fresh after some nagging Windows issues. Today I installed Mp3tag version 2.66 and the add cover dialog box again defaults to directory where the files being edited are in, if I am editing multiple mp3s. If I am editing only one mp3, a single as opposed to a whole album, the dialog defaults to the current working directory.
I'm not 100% sure what the behavior was the first time I upgraded to 2.66 for single files but I don't remember ever having to browse around for the correct folder. I would assume the behavior for a single file would be the same as for a whole album of songs.
Windows 7 Professional