Exact same issue here. Disappointing, may have to go back to using the ShareThis plugin, which worked flawlessly.
I’m having exactly the same issue. Has anyone figured out what’s causing it? I really don’t want to restore my old DB because it’s been a few weeks now since I updated.
Just found the answer in another section. Sorry! I assumed I’d need to use a plugin. I didn’t expect this to be handled through my User account, though (I’m an admin on the site and thought I could turn it off at the admin level).
For anyone with the same issue, just go into your Users tab and then uncheck “Use the visual editor”.