I'm experiencing the exact same screen locking issue. I just purchased the Toshiba 14" USB display and downloaded and installed the Mac OS 1.7 DisplayLink driver. I'm also running 10.7.3 on my 2011 MacBook Pro 15".
This has to be an issue with the driver. Because if I uninstall the DisplayLink driver the issue goes away. I've also tried the alpha version 1.8 and had the exact same issue.
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