Small waveforms

Hi all

Just recently upgraded to a 64 bit system with my Sonar 8, and have encountered a small problem. The Graphic representation of of my waveforms in track view has always been what i would classify as a normal size, but now they are very narrow and hard to see. Even when i zoom right in on them they are still small. The levels are all healthy and not a problem at all...Has anyone encountered this, and if so any ideas for a work around?
Cheers Al