Bug#724800: Xlib: extension "RANDR" missing on display

[Trevor A <astrope@tabbweb.com>]

Package: xvfb
Version: 2:1.14.3-3
Severity: grave
Justification: renders package unusable

I can no longer use Xvfb or xvfb-run after upgrading. Below is the output of a scenario that worked prior to the upgrade.

astrope@trevor:~$ Xvfb :1 &
[1] 25891
astrope@trevor:~$ Initializing built-in extension Generic Event Extension
Initializing built-in extension SHAPE
Initializing built-in extension MIT-SHM
Initializing built-in extension XInputExtension
Initializing built-in extension XTEST
Initializing built-in extension BIG-REQUESTS
Initializing built-in extension SYNC
Initializing built-in extension XKEYBOARD
Initializing built-in extension XC-MISC
Initializing built-in extension SECURITY
Initializing built-in extension XINERAMA
Initializing built-in extension XFIXES
Initializing built-in extension RENDER
Initializing built-in extension RANDR
Initializing built-in extension COMPOSITE
Initializing built-in extension DAMAGE
Initializing built-in extension MIT-SCREEN-SAVER
Initializing built-in extension DOUBLE-BUFFER
Initializing built-in extension RECORD
Initializing built-in extension DPMS
Initializing built-in extension X-Resource
Initializing built-in extension XVideo
Initializing built-in extension XVideo-MotionCompensation
Initializing built-in extension SELinux
Initializing built-in extension GLX
[dix] Could not init font path element /usr/share/fonts/X11/cyrillic, removing from list!
export DISPLAY=:1
astrope@trevor:~$ firefox

(process:25902): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed
Xlib:  extension "RANDR" missing on display ":1".


I also tried it with the +extension RANDR with the same result.