I was responding to this thread...
The original posting user has a space in their username and it seems using the (at) tag does not work for this case. It just assumes you want to tag the text before the space. In this case @a instead of @A Chang. This happens even when selecting the user from the drop down.
This was the case as well with a thread where the OP was named "David Something" (not really something but anyways) and when trying to tag the OP the tagged became another user that had the name "David".
I think it's more or less impossible to handle this in the @ functionality and I think it's better to not allow spaces in the names.
Would definitely agree with the not allowing spaces in usernames approach.
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