Note that the same problem occurs if Mathematica runs on Gutsy but connects to an X server on a different machine running Hardy. So there really seems to be some communication problem (because connecting to a Gutsy X11 server works fine)
Note that the same problem occurs if Mathematica runs on Gutsy but connects to an X server on a different machine running Hardy. So there really seems to be some communication problem (because connecting to a Gutsy X11 server works fine)