Why can't I record with the back of my camera on instagram?

I don't know if it's my Iphone 5 or what but I can't use the back camera to record a video on Instagram just the front! My back camera records perfectly fine on the Video Recorder but when I use it on Instagram it completely closes AND signs me out! Anyone else having this problem or know how to fix it?

I have a lg optimus g android with ice cream sandwich 4.0 software and i can only use the front too. My friend has nexus 4 but he can use front and back to record… I'm surprised you have a iphone 5 and your having the same troubles as me and i'm with android.i've tried deleting the app twice but that hasn't worked.

Yes, i have the same problem on my iphone 5