Hi ATR and Phil,
Sorry for the link that appears not to work in all browsers. In Chrome it did... I going to removed the content.
What I have seen:
1. HD content couldn't be shown in the edit preview with newer drivers (settings I use: DSLR 1080p, 24fps
2. I think I have seen the edit preview work shorty I have physically the dust from my processor, power supply, fans etc.
3. SD has alway been working fine
4. Text styling was completely mixed up with driver 337
5. Text styling and editing preview works just fine with driver 320
6. I have tried driver 340 beta (because de-installing and installing had messed up my machine I had a serious problem with showing pictures in View NX: Gradients were banded, a greenish glow was shown and darker regions darkened completely out: solution I didn't use the correct ColorSpace in my Windows Screen setting). With the 340 beta driver I have seen a old HD project working, but a newly created project didn't work.
I'm very glad to know that the machine speed isn't involved. I'm also very glad I have read that new cards not in all cases can be used with driver 320. I was considering buying a new machine, but I think I'm going to postpone it for a while.
Thanks for all your information and effort!
Regards, Jaap