Issue with mouse-map

Well, after some configuring i manage to get it work really great, even the macro part went well but... the mouse-map doesn't want to work with me the way i want it too or i'm doing something wrong... Here is the case:



I've got 2 shamans as i multibox with, 1 named Bill, 1 named Bull.

Bill is my main character that i am controlling and into my keybinds to action bar i have mousebutton "Xbutton2" as it says in mouse-map.

On this barbutton i've putted Earth Shock on Bill and in mousemap i added key #4 to this mousekey.

On my follower(Bull) i putted a macro saying /assist Bill /cast Earth Shock on barbutton #4.

Now the problem is when i click "Xbutton2" on my mouse the follower(Bull) doesn't use barbutton 4 where the macro is and mouse-map designed to. I have no idea if i wrote something wrong or did something wrong but could really use some help here if anyone knows what's wrong :)

If you don't understand due to poorly written by me feel free to ask and i'll try to specify..

Thanks for reading and hopefully replying ;)

Nobody that knows? :(

It appears to only affect the "Xbutton2" mousekey, it's one of the keys on the side of the mouse.

I'm using Logitechs mx 510, anyone else knows about this? That bloody key is sort of the one i use most in this game =D