Screen Sharing problem on Mountain Lion

Hello,
having some problems with new Messages app on OS X ML. When i chat with a friend (GTalk protocol) we are unable to create a screen sharing enviroment. The worst case is that after accepting an invite (no matter which direction) we can hear the sound (talking to each other) but the video (screens) are not showing up?
Anyone having these simptoms? Any solutions on this matter?
Ty in advance.

just to update this a bit. Today I have tested this scenarion a few times and both times it worked without any problems. Havent changed a thing.

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