I've attached the x2goclient (4.0.3.0-20141021-debug) log and the VcXsrv log of when this bug is triggered
The X-Server command line options I am passing are shown in the .png. They are: -multiwindow -notrayicon -clipboard -logverbose 3
-logverbose 3 does not do anything.
On IRC, user nkef posted a practically identical VcXsrv log: http://pastebin.com/raw.php?i=5Dj2rx5y