Edit CSS is now not saving upon editing anything.

The first thing to check is whether any other plugins on your site may have a conflict. Please check our Known Issues list here:
http://jetpack.me/support/getting-started-with-jetpack/troubleshooting-tips/

You can also try to deactivate all plugins on your site, and see if that resolves the issue. If it does, then activate them 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 Fifteen) and trying again.

Please let me know how that works for you! If you continue to experience trouble, could you please provide me with your site URL so I can take a look? Thanks!