Hi there,
I just upgraded from X2P to X3P and now the piano roll view page will not scroll. The Now time bar scrolls with playback but the page stays stationary. This is now occurring in X3 AND X2 and in ALL projects. Applied the X3E patch, so I'm up to date. Gotta be something simple, (it usually is), but I just can't figure it out. Searched other threads, one said to right click time line, that did not seem to provide a solution. Please help. 
Thanks,
Jim
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Well,,,,,,,,,SOLVED !!!!!!
This is a first for me. I said it was probably something simple,,,,, It was.
Evidently one of my son's cats managed to step on my Scroll Lock key. They only walk on this keyboard a dozen or so times a day.  My wireless keyboard has no "Lock" lights, to conserve power i guess. Spent half of the day trying to figure this one out. Yay me !!!