James and Brian, If the device is powered up and nothing has been written to it, then there will be approximately 5kΩ resistance from the wiper to the low terminal and 5kΩ from the high terminal and the wiper. The power on default value for the wiper is 0x40. If the device is powered off the then the resistance is undefined, as discribed in section 11.4. This is because all the switches in the resistor network are unpowered, and the ESD diodes on the pins are all at the same potential. You could expect the behavior of the pins to be that of back-to-back diodes all connected to GND. Thanks, Paul
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