Tom Goddard added the comment:

I've seen this crash about 50 times in the UCSF Chimera molecular visualization 
package, same traceback, and it is caused when a tooltip is raised, but not 
from IDLE.  The key observation is that it only happens on dual display systems 
where the second display is positioned partly or entirely above or to the left 
of the primary display.  An attempt to raise a tooltip on that second display 
causes a crash.  This seems almost certain to be a Mac Tk bug.  At first I 
thought it was caused by the x,y screen position of the tool tip being 
negative.  But when the second screen is arranged above the primary screen (in 
Mac display system preferences) the y position is which increases from bottom 
to top is something like 2000, not negative.  Currently my hunch is that the 
tooltip popup window was created for the primary display, and trying to 
position it on the secondary display is for some reason an error.  I don't know 
enough about the native Mac NSWindow to say anything definitive.

Hope this helps you to at least consistently reproduce the crash.

----------
nosy: +goddard

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16177>
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