The icon for a minimized RubyMine window is broken in 2.0.1. Minimizing to the dock briefly shows the minimized window with the RubyMine image overlayed (like it did in 2.0) and then suddenly switches to just a large-ish, blurry version of the RubyMine logo by itself. It makes it difficult to tell multiple RubyMine windows from each other.
This is how it appears in 2.0 prior to 2.0.1 being installed. It shows up briefly and then switches to the image below it.
This is what the icon switches to.