Can't select services on UI screen

I can't select any service using the "Choose your services" selector. (The extra services work fine.)

Here is the Javascript error:

Uncaught TypeError: Cannot read property 'title' of undefined
    at Object.stlib_picker.setupPicker (stlib_picker.js?okdmco:79)
    at sharethis:332

I'm using the latest dev version (7.x-2.13+10-dev), have cleared all caches, and ran update.php.