We got a load of visualisers on the HTG this year, which I have been setting up. They work fine for all computers I have tried them with, apart from 2 laptops. Both laptops are Toshibas with ATI x1200's. The way they are set up is with the projector plugged into the visualiser, and then a cable from visualiser to laptop. The laptops wont recognise that there is a second display plugged in (works fine for projector only), any ideas? Tried updating drivers etc but nada. They work fine with desktops with ATI graphics, and fine with laptops with intel graphics.

Anyone else experienced this or something similar (with or without visualiser)?