Jeremy - I'm no pro. I don't know how to disable the WP_DEBUG constant (#) or even what that means. I try to keep my sites updated at all times, but having so many to update when WordPress issues an update, it takes awhile for me to get them all done. I'll try what you said.
Right now, for example, because of the Jetpack error, I can't even login to my admin access at all. the /wp-admin login only shows me more error notifications, and I can't see anything else. That is, I can't see WP_DEBUG bcause I can't see anything but error messages. So I have to go in from my server side, delete the Jetpack folder from my plugins folder, and then what? Reinstall Jetpack?
I've completely lost faith in Jetpack, although it offers such great features. I've been surprised too many times when I've sent someone out to look at a site and was told "There seems to be a problem with your site" and it is always Jetpack. How can I avoid that? Any ideas? Thanks.