If you open the options menu while playing your game made with Game Guru and click Main Menu, you will be sent to the main menu without a warning to save or asking if the player is sure (all progress may be lost). It instantly takes you to the main menu which results in losing all progress if not saved.
This is for stand-alones. However, if the menu system is indeed written in LUA this may be something we could fix ourselves. For those knowledgeable enough. Thought I would bring this problem up however. Might be worth adding the prompt.
