I think the whole deal with Hex is just save often.  It's a shame that such a nice and easy-to-use piece of software has to be treated like a redheaded step-child by Daz; but, I guess it's a matter of getting what you pay for.  Then again, even Photoshop will freeze up and crash on me once in a while and it's a $700 behemoth that's been around for nearly 2 decades.