Hi Jafula,
thanks for the reply,no I don't have any Jamba/Strobe commands in either Leader Switching or Attack commands.
I could disable Jamba in the addons and nothing would change for me.
It is only when I activate Jamba follow strobing does the problem occur,it was working properly prior to installing 0.5 release,if that makes it any clearer.
I will say that fireymerlin's instructions helped a load with my lead char,now she doesn't follow other toons when activating attack,but the problem still persist with the others.

Big thanks to you Merlin that big post helped me alot,and at least allows me to use Strobing for my lead char around Icecrown,and check I have everything set as suggested by you.

Does this all make the problem any clearer?