TV monitors are powered down. One TV is showing your signal as reprocessed by the hub. Normal condition when your is first site to connect to the hub. Wait for other sites to connect. Make sure Monitor 2 is connected to the Monitor 2 connection, not one of these.
Picture freezes often during call Line transmission errors.
If persistent, try hanging up and reconnecting. Polycom ViewStation problem. Power cycle your Polycom ViewStation and place the call again. If this does not clear up the problem, tell your site's video conferencing technical contact. Observe whether situation improves when there is less motion at far site, or less network traffic.