I face the same problem. I see green rendering bar building up from beginning of timeline, even when playing clips in the preview window. It slows playback and cause stuttering. Very disappointed as I updated to patch 2231, thinking Cyberlink addressed the issue.
I'm using the latest 332.21 drivers (from manufacturer website) for my card.
I believe Cyberlink has stopped official support for PD10. My solution was to go into Nvidia display controls, access "Manage 3D programs", and disabled/turn off all CUDA, AA, mapping, filtering effects etc. You may wish to try to see if it solves the problem. The tradeoff is that you cannot use hardware acceleration & decoding. OK for me, since PD10 produces best quality video using pure CPU software encoding.
Intel i7 3770 CPU
Asrock H77 Pro4/MVP Motherboard
16 GB Kingston DDR3 PC3-10600 1333Mhz RAM
EVGA GTX 660 Superclocked 2GB Video Card
Hitachi Deskstar 1TB 7200rpm SATA2 Harddisk
ANTEC EarthWatts 500W Power Supply
Windows 10 Home 64-bit OS