Recent update of python2.7 package in Debian testing removed _PyFPE module.
Xpra 2.1.3 from prebuilt package crashes with error:
/usr/lib/python2.7/dist-packages/xpra/codecs/vpx/decoder.x86_64-linux-gnu.so: undefined symbol: PyFPE_jbuf failed load posix keyboard bindings: /usr/lib/python2.7/dist-packages/xpra/x11/bindings/keyboard_bindings.x86_64-linux-gnu.so: undefined symbol: PyFPE_jbuf
Locally built xpra 2.1.3 works fine.
The Debian packages provided by xpra.org do not support Debian testing.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1673