Same here
The very same thing happened to me yesterday. I have an Mimo UM-710 USB monitor attached to my MacBook Pro 5,1 with Lion 10.7.4 ... everything was working just great for years. I have been using 1.8 alpha driver since it was released.
Now suddenly yesterday my monitor stopped working. In Displays it shows resolution of 0x0 and this is in my log:
21.6.2012 14:20:56,782 DisplayLinkManager: SCNetworkReachabilityCreateWithAddress[Pair] called with invalid address family 1
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