Back glass of panoramic sunroof stuck open

[E83Gill]

I've had my X3 now for around 4 trouble free months. My BMW warrantee expired a couple of weeks ago and my X3 has manifested its first problem. Yesterday I noticed that the Panoramic sunroof was open (tilted). No big deal – its primarily my wifes car and she may have left it open, well I tried to close it however only the front glass returned to the shut position. The rear window seems to be stuck in the tilt position regardless of what position or combination of sunroof button is pressed. So far I have tried to:
(1) resync by holding the button pressed in for a long time- the sunroof moves around but the rear glass remains stuck in the tilt – thus not allowing the roof as a whole to slide back.
(2) The manual override tool has the same effect as above – stuck in tilt.
(3) I have had a root-around examining if anything has snapped. I cant see anything however there does appear to be some kind of physical block which isn’t allowing the roof down.

I am reluctant to physically force it shut. Has anyone experienced anything similar – warrantee repair or otherwise? If so what was replaced?

Maybe you X5 guys can chime in, Its my understanding that the same panoramic roof is available on the X5

2004 X3 3.0i Sport