I solved it!!! Just click on the object, at properties bar, select the Global to Yes! But now, it's not working anymore... wtf??? Okay, now it works but after I pressed the white theme icon twice. Or it will just be the default one, which is black... ugh... is this engine is really unstable???
It could be a bug, but it's more than likely a problem with your Events, but if we can't see what you've done then it's impossible to help you effectively.