I've done a little more experimenting:

Crossfire DISABLED - HW Decoding & Acceleration ENABLED - works just fine but it only used the 2ndary GPU when producing. The primary GPU had almost no load on it and the 2ndary GPU didn't show much of a load: 510MHz (of a 910MHz max) and generally around 10-20% load

Crossfire ENABLED - HW Acceleration DISABLED - HW Decoding ENABLED - system still blacks out and freezes

Crossfire ENABLED - HW Acceleration and Decoding DISABLED - seems to work just fine. Producing doesn't take that much longer either, perhaps 10-15% longer.

Thoughts?

I've done a little more experimenting:

Crossfire DISABLED - HW Decoding & Acceleration ENABLED - works just fine but it only used the 2ndary GPU when producing. The primary GPU had almost no load on it and the 2ndary GPU didn't show much of a load: 510MHz (of a 910MHz max) and generally around 10-20% load

Crossfire ENABLED - HW Acceleration DISABLED - HW Decoding ENABLED - system still blacks out and freezes

Crossfire ENABLED - HW Acceleration and Decoding DISABLED - seems to work just fine. Producing doesn't take that much longer either, perhaps 10-15% longer.

I am so glad I found this message. While I cannot provide an answer to your problem; I disabled HW acceleration and decoding and finally got a project to get all the way through producing the MP4 file.

My project consisted of 8 MOV and 25 JPG files. I used the Magic Movie Wizard with the Extreme Sports preset to create the movie. Once I moved on to produce the movie as an MP4, PD11 constantly crashed within the first 20 seconds of the movie. Rendering the movie with HW acceleration and decoding turned off allowed PD11 to work; although my render speed was a little worse than real-time.

Hopefully CL monitors this forum and can trace the error. I would be happy to ZIP up my project and send it to someone if that helps.

I also was having unsuccessful renders and burns until I unchecked HW Decoding & Acceleration on my Crossfire enabled rig.

Unchecked - all good

Cyberlink rarely monitors this forum in an active sense. A few mods may intercede/comment/act, but don't count on it. The experts here can solve most issues. Most. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
Nvidia GTX 960(4GB)/16GB DDR3/
Canon Vixia HV30/HF-M40/HF-M41/HF-G20/Olympus E-PL5.
Tape capture using 6 VCR, TBC-1000, Elite BVP4+, Sony D8 camcorder with TBC.
https://www.facebook.com/BarryAFTT

This mod reads the forum and lets CyberLink know of issues.
Dafydd
Forum Moderator - in charge of all PowerDirector Forums.

"Mods" can't be everywhere all the time, of course, but the point has been made repeatedly over the years that Cyberlink does not monitor the Forum, and certainly don't get involved in every little quirky issue. Lately I have seen users take a stab at support via the Facebook page. Running astray here of the topic now. But someday when I grow up I'll HAVE a Crossfire thingy and all these threads will be revisited by me! HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
Nvidia GTX 960(4GB)/16GB DDR3/
Canon Vixia HV30/HF-M40/HF-M41/HF-G20/Olympus E-PL5.
Tape capture using 6 VCR, TBC-1000, Elite BVP4+, Sony D8 camcorder with TBC.
https://www.facebook.com/BarryAFTT

I wasn't sure if I had Crossfire or not. I don't. I am using a Samsung Core i7 (3rd Gen) laptop using the nVidia 650M GPU. There is also the built-in Intel HD graphics 4000 included on my laptop. I have PD11 set to always use the nVidia GPU. Drivers for both GPUs are completely up to date. Just for kicks, I tried to render the same video using the Intel GPU. It still crashed.

Other movies will render fine with HW acceleration and decoding turned on. So there is something quirky with this project that forces me to turn off the HW acceleration and decoding to get a full render.

As I said before, if CL is interested in probing this issue, I don't mind zipping up the project to send for analysis.