I got an email from SW with a fix, and this seems to have worked so far:3. Then Go To Add remove programs and choose to remove or change .net 2.0 then choose repair.
I was having frequent crashes and could guarantee to produce them by clicking outside of the window displaying a running job (like the one that pops up when you issue a command or test a job). I saw the above post and though it would do no harm to "repair" the .NET installation. I shut down the app, ran the installation program and selected repair, and I have had no further problems with the app crashing.
Thanks for the feedback!