Using V2.46a, trying to write tags and art to files that I streamed from the net, therefore no existing tags.
Program will write all written info (artist, title etc) but when I highlight the file name in right side pane, then right click on the blank space where the artwork is supposed to appear, and click on add cover, I am told tags have been written, and all info is there, but sadly the artwork never "takes". If I then try to remove cover, and then add cover, same thing, no artwork, tho the artwork DOES show in the proper pane in the program .
Whassup with that ? It worked for me for several days, now it doesn't. I did an uninstall, then reinstall, no difference.
As far as I know, pc has not been changed in any way, no programs added. Scan with Malwarebytes shows no virus, etc.
Is my 15 minutes up already ? 
Update:
I did a sytem restore and went back 2 days & its working ok now. I had noticed I got some auto windows updates yesterday, so maybe that affected a registry entry somehow.