I'm sorry but I cannot send out any samples of this. But the message tells me that the problem is within the IBIS models.
Have you assigned IBIS models to your devices (Analyze, SI/EMI SIM, Models)
If you have done so, It's beacuse no 'Mate' pins are assigned for differential pairs.
I have a movie that shows whats wrong, but cannot upload files of size more than 750Kb - but in the models dialog, select the component then edit model
Click the pin and set the type to inverting/non-inverting and set the correct mate pin.