[R-SIG-Mac] graphics problem from Macintosh system software

Charles Berry ccberry at ucsd.edu
Fri Dec 18 05:05:21 CET 2015

Erich Neuwirth <erich.neuwirth <at> univie.ac.at> writes:

> Do you have any idea under what circumstances this happens.

I am getting a bunch of CGContext* error messages, too. But not exactly 
those listed by Rich.

I can reproduce them by running R-3.2.3 from a terminal, typing 
`example(hclust)', hitting RET to display all the plots, then clicking on the 
green button on the graphics window once to enter full-screen, and once to 

I get the further message:

"If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE 
environmental variable."

and Googling it leads to https://forums.developer.apple.com/thread/13683, 
which has posts saying this is an Xcode issue and had a message as recently as 
yesterday saying that it is still a problem.


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