I'm just tried briangig and chandler767's solution of the kextload and it appears to have solved the issues of Finder crashing, Login box not working and Flash crashing.
However the third screen (second external as I already have one out the mini-DisplayPort on my iMac 21.5") still isn't displaying any image and if I go to Displays in System Preferences it doesn't show anything.
The device I'm using is USB 2 HDMI from Maplin, and the product code it gives is UHD-100 U3 from running system_profiler SPUSBDataType on Terminal.
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