I figured this out after a lot of googling. This happens when a background process in Mac OS generates events that inadvertently grab the window focus. See this discussion, esp comment #48, which includes a script to help diagnose the problem:

http://xquartz.macosforge.org/trac/ticket/58

The same HP software on my machine was doing this. The fix is to permanently disable the service (it seems unnecessary) by running the following.

launchctl unload /Library/LaunchAgents/com.hp.help.tocgenerator.plist sudo rm -f /Library/LaunchAgents/com.hp.help.tocgenerator.plist

For more details, see:

https://discussions.apple.com/thread/2788162

Hope this message at least helps someone else who might have experienced the same issue. x2goclient now works perfectly for me on Mac.

Jeff

On Fri, Oct 3, 2014, at 02:21 PM, Jeff wrote:

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

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