Well, that was interesting. Monitored voltage at pin 3. Initially it was at -35V. I started turning Vr1. Voltage was jumping around a lot, but did not really seem to correlate with moving Vr1. Over time the voltage came down, but still swinging a lot. Eventually after about 2 minutes it came down low enough to come out of protection briefly. Again voltage was swinging from -35 to +7, but would settle in a smaller range for as little as 3 seconds to 15 seconds. Then after about 5 minutes the voltage settled down below +/-1V, and it remained OUT of protection. At this point adjusting Vr1 did seem to have an effect, and things seemed stable. At this point, it really does seem like a temperature issue, such that things seem to settle down when components warm up. I really appreciate all the help you are giving me Pete! Any idea what is happening here?