After fixing this, I ran into a new problem with permuted or scrambled keyboard layouts.

Changing the graphics compression algorithm caused the keyboard map to become permuted. Perhaps something about making changes to a session configuration disrupts the keyboard layout?

I found a previous post with no resolution that referenced another (now inaccessible) post also with no resolution.

Per the advice on this forum post I removed they X11 keyboard configuration (sudo rm -rf /usr/X11/share/X11/xkb). This broke XQuartz. I moved the X11 folders in /usr out of the way, reinstalled XQuartz, and rebooted.

After that, X starts normally and x2go works. The keyboard map is normal.

On Sat, May 7, 2016 at 5:41 PM, M.Rule <mrule7404@gmail.com> wrote:

This issue has been reported before but I did not notice a resolution in that thread. Applying the fix suggested here did not work. This post ended up being the most comprehensive review of the issue. It suggests this command to fix the tab key behavior in XFCE:

$ xfconf-query -c xfce4-keyboard-shortcuts -p /xfwm4/custom/'<'Super'>'Tab -r

This worked for me.

On Sat, May 7, 2016 at 3:10 PM, M.Rule <mrule7404@gmail.com> wrote:
It seems to affect all applications. Cannot insert tab in text, cannot tab complete in terminal. Alt+tab, control+tab, and command+tab all still work and register with the xserver.

Has anyone seen this / solved this before?

Configuration:

OSX 10.10.5 Yosemite on a late-2008 aluminum macbook
Client: X2Go Client v. 4.0.5.1 (Qt - 4.8.7)
Server: Ubuntu studio, not sure what versions at the moment

Best,
Michael.