Package: x2goclient
Version: 4.0.3.2

Clipboard works well, when I open new session. But when I connect to
current desktop session clipboard won't work...

Client - Win7 x64 SP1.
Server - archlinux x86_64

uname -a
Linux home 4.0.0-2-ARCH #1 SMP PREEMPT Tue Apr 14 07:14:46 CEST 2015 x86_64
GNU/Linux

DE: XFCE 4.12