bugs for HNK emulation:
1. Timer has buggy graphics (obvious)
2. Characters are very slightly translucent (not so obvious, pick mr. heart to see what i mean)
3. pre-fight and post-fight poses take longer than usual to complete (can be skipped with any button though, so no problem)
4. if you set player 2 to KEYBOARD, player 2 Start doesn't work. If you leave player 2 as GAMEPAD you can still assign keyboard keys, and player 2 Start will work, though.
5. Emulator sometimes chops up sprites when you for example mash "down" very quickly - i assume that when you make a sprite change too fast, the emulator gets confused. Also happened when playing Heart vs. Heart & only walking for a bit.
6. might just be me, but i think there's slight lag right after the start of a round.
7. again, not sure, but there might be some overall very slight input lag.
tested both 32 (xp) and 64 (windows 7 beta), runs perfectly smoothly on my rig (quad core, 4 gig ram, nvidia geforce 8800gt).