Just noticed something strange that I've never seen before. Using 2.3 stable when I hit the trash can button to access the ML menus, I noticed a quick screen flash. It was too fast to determine what it was, so I recorded it and did a freeze frame. It breifly displays the picture style settings screen.
I cleared all settings from the canon menus, and removed the user def picture styles. Same issue. Then completely removed ML, formatted the card and re-installed, same thing only with the default canon picture style flash. See video below.