names reverting back to the previous name after being saved....

I downloaded Mp3tag about a week ago and so far most everything is going really well. After the first few days I started to run into problems with renaming some of my files. Album artist and Album name keep going back to what they were previously named and the rest of the information I fould through the Amazon link stays the same. It doesn't happen with every file but its happening pretty often and I downloaded the program to get all of my music organized so that I can find things easier on my Zune. One suggestion I've gotton was to make sure that everything is saved once I've gone through and found the right album and songs, etc...and everything is written and saved after every edit. I'm really hoping someone can help me out with this - its the ONLY problem I've run into-much easier to use than my actual Zune software...I'm also not very educated I guess you can say when it comes to all of the terms, etc. for this kind of stuff-so please no fancy words lol

Thanks for the help!