Whole Cataclysm Guide is Level 80.

I just dinged 81, then the hell started. Every quest is marked obsolete, and doesn't auto update when I accept / turn in quests. Please fix this.

[aanguk]

Easy way to fix it: Settings -> Dynamic Progress -> Allow levels ahead -> slide all the way to right side. That will disable SIS and will fix your problem.

[Zygor Admin]

Or just update to the latest version of the guide (version 1568) which disables SIS by default now.