It seems to only work every other day!
I have played with Graphics Drivers as I am getting video freezes (for a second or so) on streamed and downloaded video (Demand 6 & BBC iPlayer) but that looks to be an 8.1 issue.
I have a laptop with 2 graphics cards (no idea why or how they work together). Both were updated by Windows Update after I upgraded to 8.1. Downgrading both (one at a time) has not helped the video problem. Downgrading the Intel HD Graphics 4000 driver back to 9.18.10.3165 (the pre 8.1 driver) is OK when DisplayLink is not plugged in but I get the constant jumpy screen on the laptop display when DisplayLink is plugged in. Upgrading the driver to the 8.1 provided version (9.18.10.3200) fixes this.
However the extended monitor is again 'working but black' today, whether I use Nvidia driver 320.49 or 326.01.
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