Continuing the slowdown bug issue:
In this video, when Ralf is in HD mode, his EX ground pound also causes slowdown. The Players even talk about it after that match is over.
From my experience with the game (Otakon), slowdown seemed to occur to varying degrees whenever anything complex was done in coordination with HD being active.
Once, the game froze at the loading screens for us (towards the end of the last day at Otakon), as the first match was loading. I probably had Chin, Maxima... and not sure whom else, the other guy probably had something like Kyo, Terry, and maybe Shen? Not sure which stage we were going to, but after restarting the system, we went to the same stage as the video above. I never personally saw it freeze again in the 2 days I was there.
Didn't notice any graphical errors (like flashing sprites, or dissapearing pieces or anything).
We did a LOT of Button checks when I played at Otakon, and this was slower than needed. I bring it up to ask this, however: is there suppose to be a default "Taunt" (Personal Action) Button? I could only get it to work by specifically SETTING a PA button, but you'd expect for something to do this action under default, such as the back/select buttons. Should be some way to access it, without button configuring.