Which driver are you using? The beta 7 driver came out 2 months ago in December, although it's not posted here on the DisplayLink forum.
Go to this site and click on the download tab for the latest driver:
http://www.doublesight.com/product/?idx=53
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MacBook Pro 6,2 // Core i7 2.66GHz // 8GB RAM
Dual 24" Samsung 2494SW monitors -- one via DisplayPort, one via ViBook+
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