I happened to have a wordpress.com account too, so I was able to hop in there, disconnect Jetpack, log out and then start over back at my site in both cases. In my case all is working well at https://www.MomOnASpiritualJourney.com even with Protect switched on (WP 4.1.1 and The Gossip Theme). I did whitelist my ip address.
At https://www.newworldenergetics.com, this did not work despite white listing my ip address and I got the dreaded line of code Fatal error: Class ‘Jetpack_Protect_Math_Authenticate’ not found in …/wpcontent/plugins/jetpack/modules/protect.php on line 221 as discussed.
Just mentioning this…since I use Customizr at the New World Energetics site. The plugins I use are not the same. Just wondering if some themes may be an issue.