That doesn't help, it merely makes it so that the top box is the big one. I messed around with about every conceivable combination of anchor settings before I posted the topic. I could make it work with two group boxes, but with three it screws everything up.
I think I'm gonna have to create an event handler for when the form is being resized, and calculate maximum height on the fly. There are a few settings I haven't played with yet, though I'm not sure if they are even related.
Google, here I come...
EDIT:
lol, you posted your edits while I was typing and experimenting.
BTW, I voted.
BTW, its a WindowBlinds theme "Precision", with a color edit. And if it makes you feel better, I just ruined my crack while checking the name of the theme. Now everything is back to normal.