My gallery fc's only when I choose a pic as wallpaper. Browsing is fine. Crap.
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mine used to do that but i found a way around that.
instead of choosing "wallpaper" from the menu button, try going into your gallery and choosing the picture you want as your wallpaper and go MENU > MORE > SET AS > WALLPAPER
that worked for me. also if, when you choose as wallpaper, it ends up showing a stock wallpaper from MIUI instead of your custom one, try setting the wallpaper as a stock MIUI wallpaper once or twice, then retry the method i just described and it may work.
this annoyed me so bad in 6.2 and 6.3(when i first installed it) nut now it works fine