I was having problems like this - I think the targetting doesn't always work quite right. Try the following:
* Press pause (spacebar)
* Select your hero.
* Hold down the Ctrl key and click near Fergus. Your hero should rotate to face him. You can let go the Ctrl key now.
* Unpause (spacebar again). Don't click or press any keys, just see what happens.
That worked for me. I was originally having a lot of troubles targetting, but I seem to have learnt how to do it now. (I'm sure theres some funnies in the user interface, but you learn to avoid them...)
