I agree that contacting the manufacturer regarding problems is necessary, however, it seems like DisplayLink is simply passing the buck and avoiding the main issues, which in my opinion are:
1. Fixing the driver properly
2. Providing adequate customer support by responding to their forums
Clearly, they are currently failing at both.
Until that day comes, I would also recommend letting their PR department know how you feel. Until they know the scope of the problem, I doubt they will change the way they are handing this situation. Here are a few email addresses to send to:
pr@displaylink.com
kim@stoweconsulting.com
Another thing to consider would be to search out other forums, blogs, etc. that discuss / review DisplayLink products and be open and honest about your experience with your device and the lack of support you have received from DisplayLink. One way or another, we should be vocal about our problems, alert others to them, and demand that DisplayLink address and resolve these problems instead of ignoring them.