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video playback sample on V3.0.5

I am changing how the android video playback sample works and in general I am doing something like this:

instead of loading all the videos at the beggining of the SDK initialaztion, I am loading videos after a marker is found... everything seems fine and the correct video loads but I have no idea why the video does not show but the sound plays and on the frame where I should see the video, it's all black! double touch goes to fullscreen and the video plays fine but on texture, the video is all black! when I switch back to load videos in the SDK initialaztion, video is shown ok!

 

any idea what could have gone wrong?

Thanks.