I managed to achieve a similar result by blocking ondemand.com via NoScript:
I find it unlikely, that a company suddenly starts to block this, most probably this was a temporary problem with the site itself (today there were a few hiccups e.g. blogs were down for a while, my activity stream was displaying blank pages once in a while). If the problem persists, and if you use any script blocker, try white-listing temporarily the sites one by one, until the page loads correctly.
Bluesky
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