Installed on my forum as well running 4.1.11 patch level 1
Only issue I had was when using @username it would sporadically not mention certain people.
I did however turn on the requirement to use a semi-colon and this seems to have fixed the issue.
As for the [mention] code I tried this using user ID's and it still shows as only the @ symbol with no links to a profile of any kind.
This however is not something we would be using a lot as we don't really go by user id #'s
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