No, you guys didnt get what the OP meant. Hes asking if dx11 works fine with stereo 3D as in 3D Vision from nvidia. Of course he didnt mean to ask if 3D games worked fine in dx11, of course they do, and with some nice special effects added.

Now, i really dont know if there is any problem with stereo 3D when using dx11 mode, never heard about it, but the best place to search for answers would be nvidias forum, since they have a specific 3D VIsion forums.

Oh, and theres this site http://www.mtbs3d.com/ which is the best in providing information regarding stereoscopic 3D, ant it isnt limited to 3D Vision, they also cover DDD and iz3D there. Check it out. They even review games to evaluate how well they perform in stereoscopic 3D. They even have a list of which games work fine in 3D and which graphical distortions appear in this mode.