Weird Render problem with vuforia tutorial

[lactoso]

I am trying to follow the tutorial from the wiki, but as soon as I try to just draw a cube over the camera image, I get this:


I think this might be related to the depth buffer? How can I fix it?

[EgonOlsen]

Hard to tell. Looks somehow as if the depth buffer doesn't get cleared, but that wouldn't make much sense.

How are you initializing the actual GL context?