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[Firepup650 (Firepup Sixfifty)]

This seems to have recently re-occured, and should be fixed soon (as the change was already merged)
New post:

Topics jumping to wrong post

Thanks so much for the clear reproduction steps @Don Yup, that’s it! Two things going on here at the same time Loading slider service needs to remove the still-loading class from the body LockOn needs to scroll to the right place They were both scheduled in the afterRender part of Ember’s runloop. And since the ‘lock on’ stuff is technically scheduled first, it was being run first. And so LockOn was running while all the post HTML was in the DOM, but still had display: none. …

GitHub PR:

FIX: Avoid scroll jumping for topics on slow connections