Blargh. Apparently, my design will have more than 300 pins, which is the limit for the free version of DipTrace. To get a version that supports 500 pins, I will have to buy the Lite edition of DipTrace for $145. This is probably the closest I've gotten to designing a PCB with the complexity of a commercial product. The market is telling me that I should be making good money if I'm designing circuits at this level. I can't though. I don't even have a college degree.