ah I forgot. Lets me thinks. hehe
Dude i tot you already have solution for tihz!
EDIT:
It also happens on the latest clients. 2013-2014 (im not sure if this is a client side or what)
EDIT again:
I searched the whisper function on the client and found [ To and ( To, i tried everything but it doesnt work i even edit the TO ~> Xo it works its just i can't remove the () on it, can't find anything on .exe
Edit 3:
Fixed, i am not sure how to posts the solution but you have to work around on [ replace all the ( and space to 1 2 3 4 5 6 7 to see it on client and it works.)