My friend has the same problem and I'm trying to help him fix it.
And if you look a few threads below yours you will see that someone else is also having the same problem as us.
Their post has already been replied to with a possible solution.
I've not been able to do anything with it yet (I won't see my friend again until next week), but you might want to have a look.
It looks promising and I'll certainly be trying it next week.