FWIW, I opened DrRacket (on a Windows system) and disabled some tools in
preference -> tools. On restart, I got a dialog with title DrRacket Internal
Error saying
preferences:get: tired to get a preference but not default set for
'test-engine:enable?'.
Pressing okay on the dialog window, just closed it. A black-console window
stayed open, but DrRacket wouldn't start. I opened racket-prefs.rktd and
removed the line
(((lib "test-engine") ("test-tool.scm")) skip)
and restarted it. It came back alive.
I then disabled all tools and restarted. That worked. So maybe I disabled a
tool that another one needed.
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