My set up:
HTPC (with PowerDVD 11 build 2608 )connected via HDMI to PIONEER SUZANO AMPLIFIER SC-LX90 with 6 HDMI 1.3 inputs and 2 HDMI 1.3 outputs on a 7.1 speakers set up.
SUZANO delivers the signal to 1.Projector PIONEER KURO KRF-9000FD or to 2. 3DTV SONY BRAVIA KDL-55HX920.
Since Amplifier cannot deliver 3D signal due to the limitation of 1.3 HDMI,i connected HTPC directly to TV with 1.4 fast (or b.) hdmi cable.
( Graphic card doesn't matter in my case since i tried 5 different graphic cards,Nvidia and AMD,as standalones,together as SLI or CROSSFIRE,even one AMD and one Nvidia.)
3D movies and sound are delivered smoothly without any problem in every case of direct connection between HTPC and tv..Even with DVI to HDMI adaptor from DVI port of the graphic card (both AMD and Nvidia) i could watch 3D movies in excellent quality,even without sound,due to the limitation of the DVI port.
The problem is the sound,since for a complete 3D movie experience you need a multispeaker set up and not tv's stereo speaker.
So i tried to connect my tv directly to a graphic card and the amplifier to the second graphic card via hdmi or one port of the graphic card to tv and the other port to amplifier.No matter if the card/cards were set up as extended desktop or clone,PowerDVD delivered the message " multiple desktops detected" ,refused to enable 3D and delivered 2D.(movie quality excellent and sound HD)
I then tried an active HDMI 1.4b splitter with one 1.4 HDMI cable to tv and another 1.4 HDMI cable to amplifier.The same message was delivered.Multiple desktops detected and failure of enabling 3D.
In the case of using 1.3 cable for delivering the signal to amplifier,probably due to the EDID of the splitter,POWERDVD couldn't recognise the 1.4 cable that was driven to tv and asked for an 1.4 HDMI cable.
After 2 months of try and error i cannot find a solution on how POWERDVD will allow extended,or clone desktop to be used while playing 3D movies so i (and everybody else with 1.3 amplifier) will be able to enjoy HD sound.And i really can't figure out why this limitation exists.
The easy solution is get another amplifier with 1.4 HDMI port.But i am not convinced why i should through away a piece of hardware worth 5.000€ just because a piece of software worth less than 100€ cannot support extended desktop on 3D.
I am a registered customer since version 8 of PowerDVD but i think its time for me to move on other software players.
Appologize for my English since its not my native language.