We have reproduced this and it is not a DisplayLink issue. It is a bug in Mountain Lion that occurs when virtual screens are added. This has also been reproduced on competitors adapters.
The bug has been reported to Apple as bug ID# 12275102. Now we just have to hope that Apple fix this in a future Mountain Lion update, as there is nothing we can do to fix this OS issue.
So if you want to see a fix for this, then I'm afraid we will have to hassle Apple.
Wim
|