Sorry for all the trouble! We’ve just released 4.8.1 to solve this issue.
You can read more about this release here:
https://wp.me/p1moTy-4N5
Please update to 4.8.1 as soon as possible to see if that fixes that issue for you. Also, if you’re using WP Rocket, please update that to the latest version as well.
If you continue to experience issues, could you please try to delete the Jetpack plugin, and reinstall it from scratch? If that doesn’t help either, could you give me as much information as possible about the errors you see on your site?
Thank you, and again, sorry for the trouble! While we do our best to test things prior to release, sometimes things fall through the cracks. We’ve added additional measures to make sure this type of error doesn’t happen again.