I've gotten normal usage of Glass-cast, as they call it, to work only 1 times in 10 anyway, heh. The feature is a distaster. You take a picture of the barcode over and over and have no feedback whatsoever what the problem is behind it not working.
Are you trying the screencast with a device that's already been BT paired & connected to your Glass?
I never see the barcode option, it just connects straight to my device immediately. I think you only end up with the barcode if you're not connected or having connectivity issues.
Google posted an update yesterday to the MyGlass app that supposedly improves connectivity, so maybe that might solve the trouble you'd been having.
