Normally doing a right-click on the cover-field and choose "Add Cover" opens an explorer Window in the actual %_folderpath%.
That is fine for me in about 99 % of all cases because that is the place where my cover-files are.
But there are rare cases (i.e. CD-Sets) where my cover-files lie in the %_parent_directory% and there is no cover-file in the directory.
Because MP3Tag does not find cover-files in these cases the selection window points to the active directory, in my case the grand-parent-directory, and I have to navigate to the right albumartist and album before beeing able to add the cover-file.
I suggest that MP3Tag inshould open these cases the parent-directory by default.