Aniamte 3 - Drawings flattening without my consent?!

Hi guys,
I’m having a problem where I’ll be working on a drawing, then when I come back to clean it up with the cutter tool the drawing has been flattened without my knowledge or consent. I checked that auto-flatten has been turned off in the brush settings. Is there some keyboard shortcut I might be accidentally be hitting or something worse?

Yes there is a manual flatten command but depending on which hotkey template you are using (Animate-Flash-Studio) the actual hotkey commands are different. If this happens a lot you may want to consider un-assigning this command from the preferences’ Shortcuts tab.