Sketchup & Webinars

Just finished watching Nick’s fire side chat session, which reminded me of a problem I had earlier this year when attempting to present SketchUp via an online webinar session. For some reason only the SU window and toolbars were visible by participants. Whatever I drew in the sketch window was ONLY visible by me on my screen. Everywhere else, nobody could see what I was drawing.

I have an intergrated graphics situation on my laptop - Intel HD 4000 with a NVIDIA GT 630M (2gb)
I was streaming to YouTube via the Open Studio software.

You can see what I experienced here. Look at the 01:05:00 mark (1hr05min).

Any suggestions how to overcome the problem?