sorry for asking this, but how you achieve some good glass with AO? i lost the test i made, but try the following, please: a ground, a cube wich is made of glass. inside that cube another small cube, with some color. try to render with ao. it gets some black shadow under the cube and the cube inside shiws black too… at leat for me. i have ray trans on, and even some settings with fresnel and stuff. if your result seens okay, please post it in this thread, with all your materials settings, so i can see if im making something wrong or its my blender version.
PS: by the way, the mirror looks normal with normal lamps