One of my students is observing some strange behavior involving the Program
Contour pane of DrRacket. He’s using v6.11 on OS X Yosemite 10.10.5.
This is the top-right corner of his DrR window, with Program Contour open:
Upon pressing Cmd+U to hide it, this is what happens:
Additionally, the previous day he’d found that (with the Contour pane open) DrR
was flickering while he typed, and (when I suggested closing the Contour pane
to see if it was slowing down the window redraws) pressing Cmd+U or selecting
the “Hide Program Contour” menu item did not hide the Contour pane.
Any ideas of what we could do to diagnose this problem?
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