Hi,
What dialing method are you using when connecting to MCU? Is it H323 or SIP?
SIP calls with MCU wherein using BFCP the content will not be displayed on the presentation display. You can resolve this by disabling encryption on MCU or on the endpoint.
You can also check under MCU Settings > Content
Content status: Enabled
Display content in normal video channel: Enabled
Also on the MCU conference configuration,
Content mode: Transcoded
Outgoing transcoded codec: H.263+
This settings works fine with my current MCU with dual screen endpoint participants.
I hope this helps.
Regards,
Acevirgil