Thanks, Pelaird. Allow me to clarify. This was a spontaneous event. I hadn't fiddled with these settings in months. When the problem first occurred, I checked all those, and they looked normal. Changing these parameters had an effect, but did not stabilize the situation. I could get it back to where I wanted, but the very next click on the start button could produce a different unexpected result. For some unknown reason, the parameters were not controlling the behavior of the app. I think I'll make a backup of the settings this time around, so I don't lose all my customizations if I have to reset again.
