I just realized that the System group of triggers has vanished from my current project. When I start a new project, it's present, but if I go back to my other application, the triggers available when I create a new event are only the ones for the sprites, boxes and mouse & keyboard. Copying a System trigger (say, Always) from a new app and pasting it into my other project works, but it doesn't bring back the System group when I try to make a new event or condition again.
I can easily transfer the work into a new app, but I'd like to know if there's a way to bring back the System group nonetheless. Thanks!