I just finished the game last night (took me forever, even though I got it the day it came out...) and finished getting the treasure chests. So i decided to finish the link portals as well.

 

Though, I recently did one in the Musketeers world as Sora, and it showed up as Riku completing it. I have a feeling this is the glitch that doesn't allow people to complete the game 100%. Is this the glitch, and is there a way to fix it?

...Don't look at me...

-looks at you-

I'm sure there will be an eventual patch to fix this, so long as enough people bring this to Nintendo and Square Enix's attention.

Honestly, I haven't experienced any glitches besides some common stuff from previous games.

Yeah I'm pretty sure this is the glitch, same thing is happening to me. I thought I was fine up until I actually beat the game, then it started happening

Yeah, I was extremely disappointed :T I was looking forward to finishing all the link portals, since that would take some time. I guess all I can do now is fight the secret boss and start the game on critical, eh? I've heard that there's way to prevent it, such as skipping the memento flashback when riku first drops.