Just tried it out, and I'm getting the opposite of Voodox, above.
Every game/system I tried that uses Retroarch works fine, but PCSX2 and Dolphin dont load, just loads the Steam client window.
I'm also using the PCSX2 Configurator plugin, whiich might be complicating things, but would be great if the 2 plugins could be used together.
I'm going to try a few more things, will post here if I have any more luck,.. does work great for Retroarch for me though, great job Lahma, thanks again