Samsung Galaxy S2 - Android 4.4 (CyanFox 2.0)
Unity 4.5.1f3 (Free version)
Vuforia Unity SDK 3.0.5
When running the vuforia image sample app (v3.0.6), and my own "hello world" app that I created using instructions from here, it works just fine on my PC with my webcam but displays odd artifacting/screen corruption on my android device. The app works correctly otherwise. It appears to occur on the 'camera' layer, behind the projected 3D world. The pattern of the corruption changes every time the app is launched. Other Unity apps without Vuforia do not have this issue.
I haven't got access to any other devices right now to try on them, will when I am able. Screenshots are attached.