Laptop, Windows 7, Chrome, all up to date everything.
I want to tag users in posts here. I type @ sign and start typing their username....as I would if @mentioning someonw on twitter.
So...
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wittierInteresting.. That happened to me on a laptop with the same specs as the one you mentioned. However, if I used my Windows 8.1 laptop, I don't get the same results. Possibly a bug.