I'm having the same trouble. Oddly, it just seems to be a problem with the 'Reveal in Finder' workflow item. If I search for or browse to a folder in Alfred 2 and hit return, it reveals the folder in Path Finder as I'd expect. If I make a workflow with 'Reveal in Finder' it always reveals in Finder not Path Finder. It's the same with files or folders selected. I rebooted to make sure it wasn't something odd, but that didn't fix it.