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Baffling! Page Not Found / Embeds are stripped

I just don't get what is wrong with my forum.

Sometimes, I try to save a draft or post a new discussion and it's fine. Other times I get a "Page Not Found" error even though I'm trying to publish it.

And when I embed a Youtube video, it displays properly at first but if I try to edit the page, the embed completely disappears.

Even worse, things seem to work fine and, without changing anything, it all goes haywire two seconds later.

This discussion has been closed.