A while back, I discovered a problem when I right-clicked on a story to share it somewhere. I could email it, but trying to send it to Twitter didn’t work. The window was shaky and Twitter or Facebook wasn’t selected and clicking just took me to the email window. I removed a couple of the options for sharing in my preferences and it now works. But it looks like if you have more than 5 options there, it breaks.
I’m using Chrome 27 on a Mac, fwiw.