Are you using a scroll-wheel rodent (mouse)? If so, you might accidently be clicking the center button (which is the scroll wheel). This can active the up/down right/left screen scroll "feature".
When the screen seems to move to the left (per your post) try moving your rodent to the left then click the wheel.
If that doesn't do it, I have no other ideas.
Regards,
gary
Linux Reg. User #206357 (Feb. '99)
"Can't get there from here."
It only seems to happen to me in Safari when using the two finger scroll on the touchpad. And it does it quite often, not all the time, but at least 60% of the time.
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