I'm using Unity 4.5.0 and Vuforia 3.0.6, I have same problem with my application and imageTarget sample 3.0.7.
If I use my LG4X phone, 1280x720 resolution, camera is ok.
If I use a Nexus 7 tablet, 1280x800 resolution, camera view is stretched.
Seems this same issue:
Can you tell me if it's a bug that need to be fixed, or if is something I must set through code? And how?
PS. I may had dreamt it, but my app was stretched, then I installed the imageTarget sample and I'm almost sure it wasn't stretched, so I went back to my app that was still stretched, then back again to imageTarget sample and it was stretched. From then, always stretched, even by restarting the tablet and uninstalling and reinstalling all the apps.This is just an hint, I'm not sure that it worked that first time.