This is the #1 complaint for the new WBFS versions. Go into USB Loader GX settings for this game and change the "IOS" slot from IOS249 to IOS250 or IOS251 . The mod uses a different memory addressing scheme than retail NSMBW.
For those looking to revisit on their Wii console, using the WBFS format is a great option. WBFS (Wii Backup File System) is a file system used to store and manage Wii game backups. By converting your game disc to a WBFS file, you can play Super Mario Galaxy directly from your Wii's hard drive or a USB storage device. mario 39s final adventure wii wbfs new
To enhance your experience:
: It includes specialized enemy ambushes, new world themes, and "Warp Cannons" that are only accessible after completing difficult levels. This is the #1 complaint for the new WBFS versions