Swipes in Safari stop working
When using Safari in Mavericks, I can scroll up and down as usual with the 2-finger gestures, but if I try to do a 2-finger "back" swipe to go to the previous page that page freezes (can't scroll at all, no links respond and if try to click on the back/forward button, the page title and URL changes, but the page is still frozen as it was). I can go to another tab and navigate with the arrow keys, but all trackpad gesturing within Safari stops working. When I quit and relaunch Safari, all is back to usual. I deleted all Safari extensions, deleted all preference files, deactivated/reactivated the gesture in System Preferences and still acts the same. Any thoughts?
MacBook Pro, OS X Mavericks (10.9)