vBulletin 5 has expanded its use of AJAX, to make various forum functions (including posting replies) faster. Basically it posts to the thread without needing to reload the page in your browser.
The fact that you can't see your sig right after posting is a side effect of this. Everyone else will see your sig, and once you have reloaded the page you'll see it too.
The fact that you can't see your sig right after posting is a side effect of this. Everyone else will see your sig, and once you have reloaded the page you'll see it too.
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