I'm trying to add the album cover images to my itunes, but when I do it won't add it to all of the songs in the album on my ipod...it just sticks to the same one. 
Highlight all of songs on the album in itunes. Use ctrl if you have to. Right click one of the files and type in information. Make sure you click each box by the new information.
Also, it just won't accept that some songs are all part of the same album.
I face this same problem. All you have to do is highlight the correct tracks and change the information to random things after right clicking one of the files. But make sure you check each box to make it apply to all selected files. Then repeat the process, but type in correct information. Restart itunes if needed.
I find this happens by each the littlest differences. Marilyn Manson and marilyn Manson won't go under the same album, even if the album information is the same.
AND, some of the songs hat my mom send me have a big explanation point next to them after like a week. How can I keep that from happening? 
I believe this is when the file is no longer in the original location. Can the files still play?