I dunno I suppose I must have. In fact when I install xcon my Facebook app stops working and so does a few other apps I've tryed. The moment I remove xcon they work again. Looks like il bight the bullet and just upgrade to 5.1 and have an un jailbroken phone for a while. All I'm botherd about losing is sbsetings really. I just use it to turn off 3G and wifi from lock screen etc.