Working with technology

Why is it, that however carefully things are prepared, when you try to do something in front of a crowd, a gremlin creeps in and mucks things up?

At the tutor workshop this morning, I was using the Docucam, firstly to project what I was doing (finger knitting) on to the wall, then to record the basic steps to play back. The projector was working just fine and there were gasps of amazement at this nifty bit of kit. But when we tried to project the short video clip onto the wall, nothing appeared but the Windows media frame with a black space where the image should be. All was working perfectly on the laptop screen - simply didn't show up on the wall. Huh.

Still, the workshop went well and people left happy and inspired I think. I hope.