Just having posted this, I noticed a previous post
"Re:Constant rendering while trying to edit problem with nVidia drivers"
Up to now I have been very pleased with the program.
This problem has only just started.
The only changes to my computer that I am aware of would be the Windows updates.
Disabling the hardware acceleration in PD has no effect on the problem.
Tried to do the same on the NVidia Panel, it would not change.
Next step I guess is to roll back the drivers as suggested, or perhaps reinstall PD.
Any comments appreciated.
RobertA101
Win10
AMD Phenom II X6 1100T
mobo Gigabyte GA-890FXA-UD5
RAM 16
Geoforce GTX 550 Ti
PowerDirector17 Ultra 17.0.3005.0