When I changed the compatibility mode for those items, I also checked "run as administrator", so PEP2 has not asked about that. So I am launching PEP2 with a single click, and so far only once have I had to restart the ProntoDataService. Do you still think I need to pursue the Microsoft Application Compatibility Toolkit?

I have imported my PEP1 config (again) and integrated my serial component stuff, and cleaned up the list of compiler issues, and the config seems to do what I need. Aside from some tweaks to correct undiscovered issues, I don't expect to spend much time on PEP2. I like how it works and I'm sorta glad I switched, but I think my days of Pronto updates are nearing an end.

Thanks, Lyndel, and the other posters, for your help, I really appreciate it.