Safari freezes when swiping back, disables some gestures

I’m on OSX 10.9.4 using Safari 7.0.5 on a July ’14 15” Macbook Pro. Occasionally, when I swipe back with the two finger gesture to go to a previous page, about 5% of the new page slides into view and then the entire tab freezes. The tab is entirely frozen in this state and going to a new url has no effect. I have to close the tab and open a new one to resume browsing.

When this problem begins certain gestures also become disabled across the whole OS. The ones I’ve noticed becoming disabled are pinch-to-zoom and the rotation gesture.

This has been happening every few hours. Once it starts happening restarting or resetting the PRAM seems to solve the problems, but it’s not long before it starts again. From searching the forum this problem dates back to at least November ’13 and it’s quite annoying, so I wanted to check whether there’s been any progress in solving it.