+++ This bug was initially created as a clone of Bug #1545909 +++
+++ This bug was initially created as a clone of Bug #1489624 +++
Still happening; same url for me as always (cnn.com), though people have reported it happening on other sites as well.
Browse to a url; wait long enough for the site to change content. Refresh to see current content (in CNN's case, it may auto-refresh periodically on it's own).
Browse to a sub-page on the site. Hit back. See original content; hitting refresh will load current content. You can now (usually/often) repeat the sequence; sometimes it will stop reproing after 1 or two instances.
I've also seen this across months and a restart - load a profile unused for a long time that was sitting on CNN before it was shut down (or perhaps had visited CNN "recently"). See current content (no refresh needed). Read an article, hit back, see months-old content. Refresh, see current, view article, back see months-old content.
I'll attach a screencast of this recorded against a local m-c build where it's happening repeatedly.