Possible Issue/Solution
I just completed a complete re-install of osx on a mid2010 MacBook Pro (10.8.4).
I also encountered issues attempting to install the DisplayLink 2.0 driver.
After following some of the suggestions in a few threads on this support forum, I discovered that the folder /Library/LaunchAgents did not exist.
I uninstalled the DisplayLink drivers, rebooted, created the directory /Library/LaunchAgents, ran fix permissions, reinstalled DisplayLink drivers, and rebooted.
The displaylink'd display starting working properly.
James
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