Started a server up and OP'd players are all fine except me. Using essentials and GriefPrevention, /egod does nothing and in my userdata for essentials I have godmode disabled. Also not in claimed land or in creative.
Advanced Portals, antiXray, dragontravel, dropheads, dynmap, enchantplus, essentials, fastleafdecay, grief prevention, guishop, holographicdisplays, invsort, lockette, luckperms, music, pixelprinter, pluginconstructorAPI, sethome, setthespawn, simplerename, singleplayersleep, spawnersilk, stacklableitems, timber, trollboss, vault, veinminer, worldedit, XPStorage.
Remove plugins one by one till you find the culprit.