I’m taking another shot with providing logs as there appears to be more than last time. Here are debug logs from the client and then server. I take it the core dumps from MATE, GLXINFO or XFCE won’t help?
Seems to crash in a similar place, from the gdb of the MATE core dump: Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f95cdc26627 in XGetXCBConnection (dpy=dpy@entry=0x5570c096b000) at x11_xcb.c:9 9return dpy->xcb->connection;
It's really the same information, your applications crash because they can't establish a connection via XCB.
This lead me to something else, though.
Server-side: rpm -qa '*x2goagent*' please.
Mihai