This happens to me a lot regardless of the system OS that I use. It's just a pretty common thing when Tapas is loading images and usually pans itself out. Sometimes, the comic loading takes up a chunk of bandwidth and just goes slower than normal.
The easiest fix is to just refresh the comic once or twice (twice usually in rapid succession), and it should pan itself out. If you're on the site for long enough too it usually hammers out on its own.