The first thing to check is whether any other plugins on your site may have a conflict. Please check our Known Issues list here:
https://jetpack.me/support/getting-started-with-jetpack/troubleshooting-tips/
You can also try to deactivate all other plugins on your site. Then, try to share again. If the issue is resolved, activate your plugins one at a time to determine which is causing the conflict.
If that doesn’t help, please rule out a theme conflict by temporarily changing your site’s theme to a default theme (such as Twenty Fourteen) and trying again.
If the above steps doesn’t work, can you please use Jetpack’s Debugger module to send us some more information about your site?
To do so, follow these steps:
1) Go to the Jetpack page in your dashboard (Jetpack -> Jetpack).
2) Scroll down to the footer of the page and click the “Debug” link (shown here: https://d.pr/i/OF6d ).
3) Click the link that says “click here to contact Jetpack support.”
4) Fill in the description box and your name and email address.
5) Click the “Contact Support” button.
Please include the URL to this support thread in the description so we can keep all your information together.
Thanks!
