We're seeing the same error as a few other groups with our OpenGL X11 software. If a user opens, closes and then reopens a window, the program crashes with the following error: xp_import_surface: assertion failed: s == NULL error: xp_import_surface returned: 2 xp_destroy_surface: assertion failed: s != NULL xp_destroy_surface error: 3 This problem is relatively recent and specific to MacOS Sierra 10.12.4-6. Previous Sierra 10.12.3 and prior versions of MacOS and other Linux distributions do not have this issue. https://afni.nimh.nih.gov/afni/community/board/read.php?1,155388,155388#msg-155388 https://stackoverflow.com/questions/44383223/xquartz-xp-import-surface-error http://cxc.harvard.edu/ciao/download/
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