No stick shaker after exceeding the pitch limit indicator

Good evening,

I have a problem with the stick shaker in the NGX. When my pitch attitude exceeds the pitch limit indicator on the pfd the stick shaker won't kick in! Neither when the IAS is in the red speed band range. Eventually it will kick in, but that's just when I'm already in a full stall, or even a deep stall. 

It something like this:   

I've had this problem since the release of the NGX. Unfortunately, SP1d (deinstall + install SP1d) didn't change anything at the situation.

Read the whole manuals twice since the release, but never found a solution. 

It happens when the plane is correctly set-up via the tutorial or any kind of flight.

Never happened in the 777 though. I've always had normal stick shaker behaviour in the tripple.

Regards,

Richy Uittenbogaard