I realize it's hard to figure out the problem without any clues, but you are as clueless as I am. I'm not trying to do anything special. It just stops working, pretty much without me doing anything. My best guess is that some files gets corrupt and stencyl can't load them. It might be, as mentioned, some security setting that messes with stencyl.
The reason why I assume this is a bug is because I don't get any compiler error or any error that looks to be related to the code. especially since the iOS version works. (I have been wrong before though)