Hi Tony,
Thanks for your response. My PowerDirector is version 13, not the trial, while I upgraded it from 12, which I upgraded from 11, and I started with version 10. I think 4K should have been available in version 12, already, but it wasn't.
Could it have been a mistake that I didn't unistall previous versions when I upgraded, do you think? I don't exactly recall upgrading from 11 to 12 but now I didn't unistall 12 and still have it on my computer and I can even run it.
I also thought that perhaps running PowerDirector on a rather obsolete low-end machine could play its role (I still use Windows XP) and wonder if DxDiag.txt information could provide any clues.
I thought I could perhaps tweak it by editing the profile.ini file but I don't think I understand that mechanism well enough…
Jirka