I've read as much on the boards as I can and I have not seen this problem/fix mentioned. I think it could also cause errors on the Game Compatibility Wiki.
I so far have 3 Wii games backed up on the Drive
SMG
Pikmin
Wii Fit
What I noticed was when I booted up one game it worked fine. Then...
Not sure if the Review I read differed from the Review you Read.
But it said he tried a Multi Image GC ISO with a size of over 100GB and it worked.
** Edit apologize you're asking about Save Games