Windows 8 pro - Remote Desktop will not /span multiple monitors

I have Windows 8 Pro and I can confirm that it supports discrete multiple monitor RDP session. I initiated the RDP session from my other Windows 7 PC by using the following command

mstsc /multimon

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That is great but how about having 2 out of 3 monitors enabled for RDP.

Right now I must confirm that configuring multimon locally, or changing max monitors in group policys, or configuring RDP host server on client settings tab regarding max monitors does not work at all.

I see that this is a big issue for many who use 3 monitors. Whatever setting you change, you always will get just one monitor or all three. Clearly it does not work so please no advice how to change these settings.

if you run (win+R) mstsc /?, it will show you /multimon.  If you run simply "mstsc" or click the "Remote Desktop Connection" icon, click the "Show Options" button, then go to the Display tab.  There is a check box that says "Use all of my monitors for the remote session".

I have tested both Win 8 Pro & Win 8 Ent with the /multimon and it checks that box, and opens RDP sessions across my three monitors.  Also manually checking that box works.