Sometimes I can double click and the album art expands in viewer window so I can see details better. Many times it does not, so I have to use explorer and go to folder and double click on the folder.jpg to expand and see details of my album cover.
I thought it may be due to either having the cover art embedded in the FLAC files, which it is, and I also have a folder.jpg in the album directory. I also thought it may be due to the size, but I'm not seeing anything consistent there either.
I sure need this to work, as I'm retagging all my 800+ classical albums now adding conductor, orchestra, disc num, publisher, soloist, etc. I can get most of this from zooming in on the cover.