exactly the same thing also happens with AJA Kona 3.
I think its a problem with Color not releasing its grip on the video card when you switch between apps.
You have to kick it to make it let go! Bad Color - go to your basket!
Adam Taylor
Video Editor/Audio Mixer/ Compositor/Motion GFX/Barista
Character Options Ltd
Oldham, UK
http://www.sculptedbliss.co.uk