I had the same problem once with my pink floyd albums, I fixed it by nameing the file name on the songs and making shure the tags were correct and then deleting the ones from the empeg and then relaoding the with the proper file names. You cant just rename them in emplode because that doesnt change the file name. Be shure your files are named like this:
Pink Floyd - A Momentary Lapse Of Reason - 01 - Signs Of Life
Pink Floyd - A Momentary Lapse Of Reason - 02 - Learning To Fly
Pink Floyd - A Momentary Lapse Of Reason - 03 - The Dogs Of War
It will work if done like the faq says.