That sounds like the problem I had. I contacted the tech support department for the proctoring company, and they sent me a link to a list of old versions of Adobe Flash Player for Safari (it was hosted on Adobe's own site), and that fixed the problem after I installed it. For some reason the latest version of flash in certain browsers doesn't work on the proctoring platform. Give the chat tech support a try if you haven't been able to take the test yet, and they'll send you a link with instructions.