"Spinning" and blank pages when trying to pay

Hi all: had a few reports from users similar to the below. People trying to pay but getting "blank pages" or eternal spins. Is there anything I can do to fix?

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When trying to login using Facebook, it just hits a please wait spinner after authorising on Facebook. Nothing in the console other than a couple of jquery-colorbox log messages. Chrome x64, version 49 and change. G+ took me through to PayPal thought, I knew G+ would be useful one day. However, the redirect back to tofop/live with all the url parameters from paypal just showed a nice white page.

Simply opening the original URL shows the youtube vid and onmy audio stream, so I’ve got access.