I've gotten fairly used to it by now and found countermeasures. About the only thing it really seems to be missing is an indication of volcanism, so I set the volcano count to 400 and used their presence to identify extrusive layers. Also removed all the non-flux sed rocks from the raws. If one is creative enough, there are usually ways to break the game that counter the manner in which Toady occasionally breaks it.
Given the nature of this forum, I should probably state that it's just my opinion that 31.19+ embark screen is broken, and that the break probably only affects my playstyle. The embark screen used to be helpful in accomplishing what I wanted in a short amount of time, and now it fails that task completely. In terms of what I try to do with the embark screen, the interface is broken. If it works for you, fine, you don't need to say it works for you as if that somehow fixes it for me.
I wonder if I should just put a disclaimer that I know it's an alpha, I know it's Toady's project, etc. in my sig to save time. Sometimes you can't even suggest that a part of DF could be better than it is, let alone that a feature is broken, without drawing the ire of the users who've taken it upon themselves to defend Toady's honor.