Hello,
I've had great success with using x2go using Debian as client and server.
I'm experiencing an issue with the Mac client (v4.0.2.1) connecting to a Debian server (4.0.1.16-0x2go1+git20140926.935+jessie.main.1). I'm using XQuartz (2.7.7) in full screen mode on Mavericks. Every few seconds, the screen will drastically flicker, as if redrawing the entire screen, or as if X is very quickly switching back and forth between windows or something. It seems to happen more frequently when I am doing a lot of mouse/keyboard activity, although it does also happen if I stop and let the screen just sit there.
Any ideas what might be causing this, or what options I might try to tweak to get rid of this issue? It's distracting enough that it really prevents normal usage.
Thanks! Jeff