Apple problem?
It looks like it might be a general problem in Mac OS X 10.8 with third party display drivers.
I tried out AirParrot (external display via AirPlay on Apple TV - it also sets up a display driver) - exactly the same symptoms as described here:
* no login window (managed to log in simply by entering the password blindly)
* some types of output don't show - e.g. iTunes video
This is extremely uncool - devices are only partly functional.
If DisplayLink have a workaround, by all means please publish it.
If the problem can be traced to Apple.. well, blame Apple and demand a fix.
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