I created a demo scene with Unity v3.5.6 with a FrameMarker (0) and a ImageTarget created from the web app.
I use the v2 of vuforia.
The FM have assigned a red cube, and the IT have assigned a green cube.
When I play the scene, and do this process:
1.- I show the FM front the camera, detects the FM and show the red cube. ->ok
2.- I show the IT front the camera, detects the IT and show the geeen cube.->ok
3.- I show again the FM front the camera and move front/back slowly, detects the FM and show the red cube AND BLINKINK SHOWS THE GREEN CUBE.
is how the buffer don't reset the content, or how if it's detecting another time the IT.
This behaviour is done in the player as a webcam in the editor as in the compiled in a iphone and ipad.