I can't get my latest-generation 11" MacBook Air to work with Cisco TelePresence.

When I connect the mini display port to the Cisco Telepresence VGA plug (using an adapter), the Cisco TP monitor is not detected or activated.

When I launch Keynote in slide show mode, it puts the secondary screen on my MBA monitor, so it knows something is plugged into the display port.

When I go to sys prefs and do 'detect monitors', my MBA doesn't see the connected Cisco TP monitor. The Cisco monitor stays dark and doesn't activate.

I'm thinking it's either an adapter compatibility issue (but it works with other monitors) or else the MBA display port is under-powered.

Has anybody else experienced this issue? Any ideas?