I am now also getting
Radeon Settings: Host Application has stopped working
error message when I boot my computer.
I am running Windows 8.1. It is a new computer and everything is fresh install.
Which monitor and how are you connecting it? 2560 X 1600 would only be available at certain refreshrates. So for example if you were trying to use the maximum refresh rate your monitor supports then that res would be unavailable most likely.
You should be using the Firepro drivers.
The monitor is Dell 3007WFC.
now using only Firepro driver. No more Intel.