Q: Keynote opens window at wrong size

Keynote 6.6.1.   When I open an existing file, or even just create a new blank presentation, the window is the wrong size (typically, about 300x100 pixels in size, located at the lower left of my main monitor).

Console log shows this:

2/9/16 8:29:24.732 AM Keynote[1170]: Unable to simultaneously satisfy constraints:

(

    "<NSLayoutConstraint:0x7f93a0ed2e40 H:[NSVisualEffectView:0x7f93a0eba560(>=126)]>",

    "<NSLayoutConstraint:0x7f93a1228580 H:[NSVisualEffectView:0x7f93a0eba560(<=-226)]>"

)

Will attempt to recover by breaking constraint

<NSLayoutConstraint:0x7f93a1228580 H:[NSVisualEffectView:0x7f93a0eba560(<=-226)]>

Set the NSUserDefault NSConstraintBasedLayoutVisualizeMutuallyExclusiveConstraints to YES to have -[NSWindow visualizeConstraints:] automatically called when this happens.  And/or, break on objc_exception_throw to catch this in the debugger.

This started when I updated from 10.10 to 10.11.