In 16.0, Allegro PCB Editor and other backend products were integrated with a new graphics engine (Open GL). The problem your are experiencing is most likely related to your graphics card. It may be necessary to upgrade the card however I would first recommend downloading the latest driver for it. For best performance, your graphics card should have a minimum of 128MB of Video RAM, 256MB would be better. Originally posted in cdnusers.org by EdH
There is a variable to disable Open GL which reverts the graphics back to what you were accustomed to in 15.x. Go to Setup - User Preferences - Open GL category then set the variable "Disable_OpenGL"