Try in an incongnito/private browser session. Do you still get a blank page?
Well...sort of. Your suggestion led me to believe there was a caching issue, though my main browser is Safari and I clear caches (not history, though) constantly. Anyway, I tried and also tried some of my other browsers on which I hadn't visited vROps before, in those it loaded fine with a local account in normal mode. In private mode only Opera worked again, the other didn't.
Here's a screenshot with all the browsers I use, one window in normal browsing, one in private mode: