if i record with sound on my 600d (ml audiorecorder), i either loose wav, get skipped frames, or camera is crashing instantly!
except i record in really tight crops....
if im in 640x480 mode i still dont get any magenta frame
i feel like photo-mode works best after 640x480, but dont rely on that! just a feeling didnt test this much
Edit: can confirm this! photo mode (m) and 640x480 work both without any magenta frame! /Edit
besides an interesting fact:
the higher the iso the more fixed (noise?) dots i get when viewing the dngs with picasa...
just like beeing said it doesnt matter in acr