Weird Guitar Hero Problem

About a week ago, we started having a very strange problem with Guitar Hero 3. The guitar controller would work as far as going through the menus and starting to play a song, but once the song would start playing, even though we could see the fret buttons being pressed on the screen, strumming would only very rarely cause the note to play, and after a very short time, we'd fail out of the song.

My first thought was that it was a bad guitar, but strumming worked fine to move menu selections, and the fret buttons worked fine to select menu options. I thought it might be the Wii controller, but the same thing happened with both controllers. My son wanted a 2nd guitar anyway to go co-op career, so we got a brand new guitar, and the same problem happened with the new guitar as well.

The solution happened to be that we needed to delete our save data. My guess is that Son was goofing around with unlocking cheats, and corrupted the save file just enough that it gaffed the program when a song was playing. Or maybe it had nothing to do with him at all. But with a new save file created, it worked just fine again.

Hope this helps somebody.