I find that my 8900's trackball will occasionally refuse to scroll down. I can feel the trackball refusing to physically move in that direction. Up and side to side movements still work, just not down. I have always fixed the problem by either moving the ball around until it works in all directions, or click it a few times to loosen it up.
Is your problem one of it physically not moving, or does the ball move, but the cursor doesn't? I am running 4.6.1.168, which I installed a couple of days ago, and it seems to work fine for trackball and cursor movement.
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