To add to Enjl's post The new posts tab also doesn't show up for me. I believe Facebook and Twitter don't show because I have the Disconnect Add-on enabled in my browser which blocks them. I'm fine with that, though New Posts not showing is probably the same issue Enjl is having.
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I normally use Firefox, and see the Twitter section but not Facebook or New Posts. I disabled AdBlock, nothing changed. I restarted FF in safe mode (add-ons disabled), and the FB section appears then, but not the New Posts. So, it doesn't seem to be related to add-ons or plugins.
The XenPorta2 options pages changed quite a bit in the recent forum updates (though clearly this was happening before then). I'm looking into it, and Loki's tried fixing it as well. We're aware of the issue.
eta: OK, I think I found an answer as to why that section appears empty now: there doesn't seem to be room for the contents that need to be displayed
in that location. so nothing does.
A very brief and over-simplified description of how the front page "works" - each of those "content sections" is a widget in the XenPorta 2 framework, and each widget knows how to fetch and display its contents. There is a layout system with a WYSIWYG drag-and-drop editor that allows widgets to be moved around, to customize how the page will look. When I moved the New Posts section above the articles list, it magically appeared:
At some point, it appears that that widget began to require more horizontal real estate to display than is available in the sidebar location - this probably occurred during one of the routine upgrades of the forum software.
Since the working location for that widget really isn't desirable, I've just disabled it, so it no longer appears at all. The information it would have displayed is readily available by clicking on "New Posts" in the secondary menubar, beneath Members.