Mine wasn't WONAFYT. Just moused over someone and it crashed. Same crash screen, though. (I go months without playing because it won't load for me, I get excited because it finally does, and what do I get? A crash on my first dungeon)
Had the WONAFYT crash several times. My screenshot looks similar to the one above. Happened in a variety of places with a variety of class and race combinations.
Also, I have been having some boxes that show up when you mouse over certain things, in the dungeon, remain for a while before disappearing. minor issue that is inconsistent but annoying. Using Chrome browser.
I'm not sure if this is a bug or just hasn't been implemented yet, but the new enhanced combat prediction doesn't take a monster's death protection into account. The prediction for your own HP bar stops after the monster's first death protection is lost and does not calculate subsequent attacks.