Album Art problems

Hey
Using version2.44
Windows xp
WMP10
Gigabeat player V40 which uses WMP10 only

I am have a problem with mutliple songs being assigned the same album art.
This is what I have done that has created this bug/problem
I saved tags to file name then cleared all tags then reassigned tags from file name.. I also moved all songs from the folder they were in.
Now I have all songs have an album cover showing mostly the wrong ones about 95% are wrong.. there are several different covers but I cant seem to find a connection between the art and song
I have checked the songs in Advanced Tags in WMP10 and there is no Art in tags
Oh and the remover cover option is greyed out
Is this just a glitch?