package: nxagent Version: 3.5.99.15-0~201803072246~ubuntu16.04.1 Severity: grave
We have the same problem here after upgrading x2go from 4.0.1.22 to 4.1.0.0.
It is independent of client version and OS (both Linux and Windows), and seems to be related to Xinerama:
when enabling Xinerama support in the client, x2go works in fullscreen, but leads to a crash in windowed mode as soon as the window is resized or moved to a different display.
when disabling Xinerama support, everything seems ok
The log shows a segfault of nxagent, exactly as described above.