update of xquartz on mac sierra causes resource issue

[sosey]

After updating to : XQuartz 2.7.11 (xorg-server 1.18.4)

Got the error on grab():

import import: No window with specified ID exists (imexam1505500606.124432) [Resource temporarily unavailable].

And yet that window and id did exist, the process hang.

[sosey]

Quiting out of the ds9 window returns the python prompt and reports:

import import: Unable to read X window image (imexam1505501434.692469) [Resource temporarily unavailable].
import import: Request did not return an image [Resource temporarily unavailable].
Image saved to dispersed_nircam.jpg_snap.png

but no actual file was saved.