I'm running Win7, and I have it set up the opposite: IDE on main and Designer on secondary.
I'm going to hijack my own thread to mention a minor suggestion for Designer:
When selecting multiple views in Abstract Designer, the Properties List will show Multiple Views Selected along with the properties Event Name, Parent, Left, Top, Width, Height so that you can change one or more of the properties to be the same for all selected views, which is great. However, the last four of these are set to "0", which forces you to blank out the "0"s for any of these you don't want to set the same.
It would simplify things if the properties were left blank instead of set to "0".