Thanks...OK, that's all taken care of now and the Setup window appears as it should, and the scope connects. But there is still a problem with at least two things:
First, the horizontal timebase. It gets "stuck" at 100 ns/div and won't go to slower settings -- see the first screenshot below for the SCPI commands it is sending as I try to go to longer timebases. It does this whether I use the mouse, scrollwheel, or keyboard shortcuts to try to increase the timebase setting.
Second, the program still fails to connect if there is some complex setup on the scope. I've tried removing item by item from the setup to see what is preventing the connection, and so far I've had no luck. If I start the scope from Default setup and add all 4 channels with basic settings, the program connects and works fine. But if I try to connect to the complex setup the software fails. See the second screenshot below. You can see that the program did set up the channel settings, vertical scales, baseline positions properly, but apparently failed before it set the trigger level (should be up at CH3 somewhere) and disconnected.
The third screenshot below is from the scope itself, showing the setup and waveforms that were current when the program failed to connect in the second screenshot.
So... starting with the complex setup, first I removed the Labels from the channels. Connect failed.
Then I turned off the Math trace. Connect failed.
Then I turned off the Vernier vertical scale settings and set the odd ones to 10v/div. Connect failed.
Then I turned off all channels except CH1. Connect failed.
Then I set the number of Averages to 2 in the Acquire menu. Connect failed.
Then I gave up to go get breakfast.