> > > > Any thoughts? > Tom 1: Something not initialized. 2: Non-deterministic execution. #2 is more interesting. I ran into this on the AVR, with it's low power "vittoz" mode oscillator, where the crystals were never designed to run in this mode. Apparently the level on the oscillator wasn't quite high enough to clock all the internal sections all the time. Other symptoms include bizarre results when running their Jtag ice, slightly wrong baud rates (always slow, skipping cycles) and occasional bugs caused by corrupt data in RAM or registers. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist