I had been using PD8 Deluxe without any rendering or other serious problems, though I wasn't sure whether my nVidia graphics card was being used. Tonight, I downloaded the trial of PD11 Ultra. As soon as I dragged an avi file into the timeline, continuous rendering attempts began. Rendering would reach 54 percent according to the onscreen indication, then return to zero, reach 54% again, and repeat this, continuously - preventing me from doing anything with the program.
I had just had the Gigabyte nVidia Geforce GTX 650 graphics card installed with driver version 306.23. Remembering this forum here, I fully uninstalled the nVidia drivers (Using Advanced Uninstall Pro - a good, thorough program). When I attempted to install version 301.42 drivers per the recommendation in this forum, the installer performed an automatic System Check as part of the process. The following pop-up appeared: "NVidia installer cannot continue. This graphics driver could not find compatible graphics hardware." I had no choice but to reinstall the version 306.23 drivers.
So, the PD11 Ultra trial program is completely unusable, as I don't know how to activate my onboard Intel graphics, and in any case don't want to use them in lieu of the new graphics card that causes no problems with Adobe Premiere Elements. At the moment, when the 306.23 drivers are uninstalled, the display looks like very old fashioned Safe Mode graphics.
The other problem I found when dragging an avi file into the timeline was a pop-up indicating that the file with PAL 25fps attributes was incompatible with my PD11 setting "PAL 25fps". (Can't see any difference myself!) Not only that, the sound which could be heard in preview from the PD11 library was muted in the timeline despite the tick showing that it was enabled. I can't make any sense of the first false alert or of the contra-indication I have described. Please remember that I had none of these problems in PD8 Deluxe, and have none of them in Premiere Elements 10, which is not adversely affected by the GTX 650 card or its 306.23 drivers.
I would really love to buy PD11 Ultra if it were usable. The interface is beautiful. The editing features look wonderful, it has Blu Ray, AVCHD, H.264 support and much more! I would love to use the hardware acceleration. But unless Cyberlink or people in this forum can help me overcome these fundamental problems (and I am a reasonably experienced editor) I have no choice but to uninstall the PD11 trial and reinstall PD8 Deluxe.
My computer specs are Intel Core i7 3770k pcu, 16Gb 1600 mHz RAM, OCZ Agility 3 SSD, 1 Tb 7200rpm SATA 3 Seagate data drive, Gigabyte H77 D3H MVP motherboard, nVidia Geforce GTX 650 graphcs, Windows 7 Home Premium 64 Bit.