My PC runs under Windows 7 -- 64bits with 8Gb memory, my version is 10 ultra 1129b

Just an example: I select a video clip for which I want to vary lightning adjustment (as explained in user guide at pages 82 and 83). Using keyframe option, I go on a specific image and create a first keyframe with, let's say, Lightning Adjustment scale degree at 25. I move the cursor on the right and create another keyframe at 50 on the Lightling Adjustment scale degree.
Normally, between those 2 keyframes I should expect the lighning to increase gradually from 25 to 50. But it does not work that way; my whole clip is set to 50 whatever I create keyframes or not with different ligthning adjustment selection.

It works fine when I want to change the Brightness for example, but it does not work with effects

I tried with other effects and the result is always the same. No keyframes work. The changes are never progressive as it should be according to the user guide.

Maybe I do something wrong or don't really understand the way it really works. I use the ultra version ugraded from PowerDirector 9. I uninstalled the software and reinstalled it without success. Maybe somebody can have some tricks or idea to help me. Thanks

The only thing I know about life is that I know nothing...