We've tried replicating this but had no luck, so we think it might be some bad JS that's cached on your end. Could you try clearing your browser cache and seeing if that fixes it?
Is anyone else experiencing this issue?
Is anyone else experiencing this issue?

Thanks to Minho for my sig!
This should be fixed now, try again!

Thanks to GrandMasterD for my sig!
Sorry for the late, late reply... I kept forgetting to get to this.
The behavior is still the same on my end, BUT I later realized that I'm blocking javascript and cookies and whatnot (whitelisting MOBAFire of course) so it probably has to do with that. I just tried it on a pretty vanilla chromium and the preview worked fine.
Fryla, are your circumstances the same?
Sorry for wasting your time :S
The behavior is still the same on my end, BUT I later realized that I'm blocking javascript and cookies and whatnot (whitelisting MOBAFire of course) so it probably has to do with that. I just tried it on a pretty vanilla chromium and the preview worked fine.
Fryla, are your circumstances the same?
Sorry for wasting your time :S
********'s a pretty good fertilizer
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Might be worth adding that preview *does* work on the forum, and the Preview beta button works everywhere (in other words, this is about the "classic" preview button).