When I try to add an album art to an album and right click the square on the left hand side, I can navigate down to where the jpg-file is, and the picture is also displayed correctly in the square. BUT when I press the "floppy disc" icon to save the picture I get an error message saying that the file could not be changed! See attached screen dump.
I have also tried to do this from within iTunes 8, but the same thing happens (only that there is no notification of an error, the picture does not show up).
I found out that when I run Vista in safe mode, I had no problem writing to those files and thus adding album art. So even if I run Vista as an administrator, it seems that it is looking SOME of the files!!! This is really a bug which hopefully will be addressed in a coming update from Microsoft!