I hope I can explain this well enough: I have a some buttons on the screen created with the new GUI system. When I launch my application in a windowed mode and interact with the buttons everything is fine. If I re-size the window everything still works great. But if I maximize the window the button interaction breaks. It is as if the bounding boxes do not scale and position correctly.
My camera is orthographic and the canvas is Screen Space Overlay. Anyone else run into this?
Sounds more like another transparent panel has scaled over the buttons. If they don’t react at all that’s the most likely case.
Move the buttons to the bottom of the Canvas that way they’re on top as far as the UI is concerned so if a panel has scaled over them it’ll be behind them.
Give it a shot anyway.
EDIT
I don’t know your setup but create that simple example again and this time try moving the anchors of each element to the corners of that element, so let’s say you’ve got a full screen Canvas with a slightly smaller panel then move the anchors of that panel to the corners of the panel itself.
You should see the RectTransform numbers get closer to 0 as you get each anchor to the corner and in fact you can then set them to 0 in the Inspector.
Then you have several child buttons on that panel, set those button the same so each ones anchors are at the corners of the buttons.
What this should do is scale the elements exactly like the parent. It might not be what you want for everything but should fix this issue unless it’s something else that’s causing it.