Panning with two fingers in Preview (OS X Mavericks)
Yes! I am having this problem. It appears to be a known problem with both Chrome and Firefox. So far, I've only seen this behavior in these two browsers. It does not appear to affect Safari.

There are posts from as early as August indicating that this was an issue.

Several posts have suggested clearing your Mac's PRAM as a temporary fix, as well as turning off the "two finger swipe to switch pages" gesture for both Mouse and Trackpad.