I redid the simulation using a subcircuit for the pot, instead of burying it in a library. The zip file, when unzipped into a clean subdirectory, will create PotTest.asc (schematic & simulation file), Potentionmeter.asy (the symbol for the pot), and Potentiometer.sub (a text based model of how the pot works).
I'm also including a .jpg with is a screen dump showing the test circuit, waveforms, the symbol, the pot subcircuit, and the netlist just before the simulator runs it.