I've been playing VC games with my Wii remote.
For some reason sometimes the software will treat the remote as if all buttons (including the D-pad) have turbo switches set to maximum. This causes unwanted effects such as in platformers your character "slides" across the screen instead of walk. In shooters, holding down the fire button causes you to fire rapidly rather than build up a charge (such as in R-Type).
I can't seem to figure out why this is happening. There are no settings for this on the Wii side. This behavior seems to start and cease of it's own free will, sometimes even in the middle of a game.
What is going on? Is there some kind of flaw with the emulation?
FWIW, I've noticed this happening most with Genesis VC games.
I have 3 Wii remotes and have tried them all. They all do the same thing, so the problem is not the controller. They all have full batteries.
I only seem to have started noticing this since the latest Wii OS update (released a few days ago). It's possible it was happening before that and I just didn't notice.