Fooling around a bit with the GUI editor i have found an odd bug. Seems that when the window is resized, the blending modes go nuts, the letter appear as black squares, and the transparencies go away, under DirectX9 only.
To reproduce the bug you just have to open the GUIEditor example, and resize the window. On DX9 only, the others run just fine, or don't run at all (software mode

).
"There is nothing truly useless, it always serves as a bad example". Arthur A. Schmitt