I think the patches have somehow screwed with the game, I've noticed a couple of odd little issues here and there after the patches. I haven't run into any game breaking issues so far though so it's not too bad.
I'm still on version 1 :) No internet at home for nearly 3 months..
The only glitch I've found which is re-creatable is on R-03, when you cut the wires to the elevator to fall down - slide & blade mode those wires, it makes the elevator fall very weirdly and Raiden will land in a stuck position and you'll have to restart :)
Plug it, play it, burn it, rip it, drag and drop it, zip unzip it