Switching between ASCII and tiles when you have any sort of menu or popup open is messed up
If you have any sort of popup open in tiles (look, dialog, quickmarked spells/skills/mindcraft selection, levelup skill/talent selection, etc), then when you switch to ASCII the corresponding interface element will be hidden.
If you have any sort of menu open in either tiles or ASCII (inventory, backpack, mindcraft, spells, class powers, skills, weapon skills, talents, quests, background, character information, drink, drop, pick, etc), then when you switch to the other mode, the menu will be hidden.