Finally got around to revisiting this issue. Last time I tried I black screened the system, but with the TTY consoles successfully in operation that isn't so much of a risk.
Seems the following fix from AskUbuntu (thanks Barafu!) solves the problem. The solution is almost identical to the fix I used for 13.04, but adds an extra line to /etc/profile:
export __GL_YIELD="USLEEP" export __GL_THREADED_OPTIMIZATIONS=1
Not sure why I got the black screen, it may have been something unrelated, as this worked perfectly on two differed Kubuntu+nVidia systems.
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