[jitsi-users] jitsi meet help

Hello Everyone,
I need help in attempts of troubleshoot jitsi meet connectivity. Randomly some client video stream not coming up at all. user can't see him self in preview window, but audio works fine for everybody.
I tried catch logs for video bridge and some debug. Only one think is I see.

org.jitsi.impl.neomedia.MediaStreamImpl.info() video codec/freq: null/null Hz

I am not sure if valid or not.

Also in most reports is on chrome 36.

My whole is setup is behind NAT.

Any help thank you in advance.