No, it's really a slow/freeze of effects. When you cast spells consecutively, all the effects would stack up around the character causing bright light and making you difficult to see. This is still minor problem. Doors and gates that would swing open when you click on it, now they don't, or appear not to. You could jump over gates in the open, what about those wooden doors inside caves or gates inside ruins, no way to get pass that.

I've tried deleting the game data and reinserting the disc to load the saved game, the problem still there. So, it's nearly white flag for me.

No one else has this problem? My conclusion so far is it happens after long hours of play, but I can't be sure if it's a definite occurrence.