Hello there. I'm not quite certain what the cause is but I have the message envelope icon at the top of my screen that shows two messages pending, but all of the usual suspects (gmail, corporate, facebook even, and even texts, missed calls, voicemail) come up naught. Here's a twist: when holding the phone horizontally, this icon disappears completely. What gives? I powered off and on my phone but still the same icon. Do other apps give notifications that appear as messages?