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I think it's probably to do with the ads being served at the top of the page, as I noticed a few had gone on the blink earlier and that may have affected the tabs. No-one in the office today, so I'll get internet ops on the case tomorrow. Seems OK on my browser (Firefox) at the mo.
Interesting... I'm having the same problem with vanishing navbar tabs – they were all there when I went to the Forum landing page, but some vanished when I clicked through to 'Active Topics', and now they're back again at the top of the page where I'm typing this.
Same ad being served on both landing page and 'Active Topics', and I'm using Aurora 19.0a2