Problem with new multi monitor support option

Dear guys,

I've got the same problem like it was already postet in this thread, but I couldn't find an answer: http://forum.unity3d.com/threads/problem-with-new-multi-monitor-support-option-in-4-6.275684/

It seems that since this option is available I can't use stereoscopic rendering via NVIDIA 3D in my projects, which worked before, I only found it out now as I tried it again with newly compiled versions. Can I somehow switch this option off? I found out that in an application provided here: https://dembeta.repositoryhosting.com/trac/dembeta_active-stereoscopic-3d the option ist shown grayed, so not usable und here the stereoscopic will work, not only because of the project's content but I can turn it on and off again. How can I manage that? I couldn't find out, neither for Unity4.6 nor for Unity 5.1.

Many thanks in advance,

RunRun