I don't use this feature, so I can't really be of help, but it might help others if you specify which server version on which release of which Linux distribution you use, and which client version on which client operating system.
-Stefan
Hi! I am using
cups-x2go: 3.0.1.0 x2goagent: 3.5.0.27 x2goserver: 4.0.1.18 x2goserver-extensions: 4.0.1.16 x2goserver-printing: 4.0.1.16 x2goserver-xsession: 4.0.1.16
on a ubuntu 14.04.1 (kernel: 3.14.18-x86_64-jb1 x86_64)
Bernhard