I've had an intermittent problem with the Commander ability "Command". Basically when my hero uses it on another unit, HE gets an infinite number of extra turns; i.e. the user of the ability goes to the top of the the initiative list every single time, no-one else gets a go. My Commander had high initiative, 29, which was possibly the highest in the battle, I don't know if this is related (Peter Huebner has also reported a problem with very high initiative units).
Workaround: my hero also had Slow, successfully casting this on an enemy unit reordered the initiative list and I was able to break out, however without some means of doing this then my Commander did seem to get an infinite number of turns.