ADDING MORE THAN 1 ESSENCE (ANY KIND) == NO JOY
I can add a single essence in the editor (e.g. Festering Essence of Destruction). If I add another green essence, or an essence of any other kind, the game crashes when it gets to "connecting to Battle.net" banner.
Not a huge deal since I can use the editor for respeccing, just something I noticed as I was copying characters I ran on the xbox into the PC.