This is a zone of a drawing view. Tables now allow you to input zones of selected tables (by clicked on them while editing a cell). When you exit the Revision Table, be sure to not click on a drawing view. If you find that it is getting in the way of your tasks, please vote for an SPR about this behavior in the Enhancement Request database via your Customer Portal. We are looking into this.
Thanks for the help. I downloaded SP 1 and made sure I was not selecting any drawing views and that solved the problem. Definitely not a fan of this feature being on as a default function... though I can see its benefit. Is there a way to turn it off in the options tab?