I've been using windows client 3.01-13 for a couple months, and it works reasonably well, but I have experienced two consistent problems -- apparently random disappearance of the mouse pointer (fixed by quitting x2go and starting again), and some problems with windows updates, especially with gnome-terminal windows when there is a long scroll job, sometimes the windows do not update (waving the mouse cursor in front of the window usually causes it to update).
I decided to test the recent 3.01-18 client and VcXsrv 1.9.4.1. First I just tried 3.01-18 with the built-in xserver. I only tested that for a short time, but one problem I found was that sound was broken. Sound works fine when I go back to 3.01-13, but sound does not work at all with 3.01-18. VLC complains about the ALSA driver and locks-up, adobe flashplayer 64-bit prerelease "square" hangs. Both apparently related to the broken sound.
Moving on, I tried 3.01-18 with VcXsrv 1.9.4.1 for a few hours, mostly web browsing. I did not have the cursor disappear, but I did have a couple serious issues. One was when the screen was not redrawn properly when I dragged a Firefox window around. It seemed random -- I was working fine for about an hour, but suddenly when I tried dragging a firefox window, it left trails everywhere, totally munging the screen. I tried dragging other windows around, and even quitting and restarting x2go, but nothing seemed to be able to redraw the screen properly after that. So I started a new session, and that worked for a while, but then it locked up completely, and I had to kill the session.
Is any of this behavior known? If not, what can I do to aid in debugging? With the exception of broken sound (which was repeatable), the other problems seemed random.