the other fix is much faster.
unscrew the two torx screws in the back pannel that are showing when small pannel is open (or even closed actually). this stops the small glass sheet from tilting open and does NOT cause any issues with operation of the large glass sheet. took 2 minutes to do this fix and no I LOVE my pano roof again (minus the rattling I does when closed, unsure why). RobX5 did a small blurb about this on the forum here. super fast/easy/revertable fix.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S