Buttons don't display

I'm not sure what's happening, but I can see the Social buttons listed in the HTML source of the page (e.g., http://dalefranks.com/blog/goodbye-wordpress-hello-grav), but the buttons aren't displaying in the Chrome browser on Macintosh, though they do display in Safari for Mac, and for Chrome, and IE on a Windows machine. It seems to be a display issue just for Chrome/Macintosh.