There seems to be a problem with Java now that I have upgraded to 13.1.
I had jre 1.7.1.6-45 installed prior to upgrade.
Apparently the OS upgrade downgraded my JDK to 1.7.0.6-24 which must have screwed up some libraries…
X Error of failed request: BadLength (poly request too large or internal Xlib length error)
Major opcode of failed request: 128 (XINERAMA)
Minor opcode of failed request: 5 (XINERAMAQueryScreens)
Serial number of failed request: 10
Current serial number in output stream: 10