I couldn't figure out if you were using VGA or DVI, but Amazon UK sells devices by StarTech for both - Not saying they are flawless, but I have a bunch at home (mostly USB2.0/DVI) and a few at the office (USB3.0/DisplayPort or DVI) that have worked without any problems.
You're connecting directly to the Mac, and not going via a USB hub right? Do you have, or can get your hands on, another system to try the adapter with?
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