BeagleBone black hang running Ubuntu X11 app over ssh


I have beaglebone black with display, Usb keyboard and mouse running original Angrstrom.

When I try to start any X11 application from my other normal PC with Ubuntu 12.04 LTS (for example Nautilus) on the board remote way, it always hang.

I can connect to Ubuntu in terminal mode without any problem.
But as soon I try to start any X11 application, beaglebone hang few moments after showing this application window.
I ordered serial cable to check kernel output, but this doesn’t bring any idea, as the board hang totally without any extra output and do not respond to the terminal.

Interesting thing, that I can do the same connecting to other beaglebone with Angstrom.
I don’t understand the difference between this two cases.

Thank you.