which game on the harddrive? only Wii games?
or a mix of Wii/gc/channels?
If it's missing type (you see only one type of games), then check your "Title origin" menu (4th icon in the top menu). We changed how the games type are selected when we added GameCube support.
If it's from the same Game type (only Wii games), maybe you have a Parental control in effect? (unlock the loader)
or a Category filtering in effect, or the favorite enabled, etc.
Check your settings, there might be something wrong.
Alternatively, you can delete all the .cfg files in the loader's folder to reset your settings and game settings.
Do you have games on only one partition, or multiple partitions? there's an option to list all partitions at the same time.
I think about another problem, but if the game were displayed with an old version, it shouldn't be related (wrong path names, use WiiBackupManager to fix them quickly).