Installed 8.9 today and the following things happen in nexuiz.
Changing any graphics option and applying immediately causes the game to crash, but the changes work fine if I restart the game.
Also when the game exits the mouse pointer returns to normal, but the screen never clears and all I see is the nexuiz logo. Things underneath still work though but I have to goto a vt and kill the nexuiz process then when switching back to vt7 everything is back to normal.
nexuiz-glx crashes on gfx settings change as well, but doesn't stay plastered on the screen on exit.