Same issue here
I have two Mac, and one of them has the 10.6 version, and the second has the 10.7.5.
With the 10.6, the DisplayLink works fine, but it does nothing with the 10.7.5.
The device is presented in the list of connected USB devices, but does not send any signal to the display. So, the display is sleeping, and Mac does not see an external display
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