When watching 3d with the glasses on, the writing in the amp's window display is slightly flickering constantly almost like a pulse, for example dts master. Is there a setting to adjust or is this a fault.
I'm assuming you're using active shutter glasses...? There is no setting, nor is it a fault. Perfectly normal. Why are you staring at the AVR's display anyway, you should be looking at the pretty 3D images on your screen!
EDIT: Wait a sec, there is a setting that might help - FRONT DISPLAY 'OFF'.