Hi Robert,
Analog functions on PortE perhaps?

Also, you say that you have a 20Mhz x-tal but then you DEFINE OSC 48, is that correct? I know the oscillator on the USB devices are a bit different and I'm not saying you've got it wrong but since it doesn't work perhaps it's worth looking into. Do a simple blink-a-led with a PAUSE 500 or whatever and verify that the timing looks OK.

/Henrik.