Message App Crashing

Hi Everyone,

I hope you can help me. My Message app crashes on opening. Quitting from the multitasking menu makes no difference. I downgraded to 6.1.4 and set up as new phone, all works fine, then upgraded to iOS7B2 and set up as new phone - works fine, but when I restore the backup it just crashes over and over.

I backed up before I installed iOS 7 the first time (a week ago) but of course it seems that backup has disappeared so would be really handy if anyone know's a fix.

Thanks heaps.