Thank you for your reply. With your kind permission I would like to comment on some of the information provided by you.

The trails can start appearing in the workspace when the model gets large. In SU, try disabling fast feedback in Windows > Preferences > OpenGL.  Restart SU. Mostly fast feedback is something you will not see.

This is not true though.
I do not consider a models under 1 Mb to be large, yet I am getting the same issues of mouse trails. Disabling the functions defeats the point of buying newest equipment. If you do have a place where I can post some images you will see a significant difference between the two settings and here I am talking about a visual appearance. Besides that, with the Hardware Acceleration and Fast Feedback - Off, SU performance is decreased badly. You feel like you are in a stone age working on Windows 3.11 or something.

It is true that 285.62 driver version for 560 GTX has issues with this new driver and Nvidia has informed me about it and even provided earlier version (285.32). So far I have four different drivers and non of them solve the problem (270; 280.26; 285.32; 285.63). It is also true that the card is sold as a gaming card but according to my research this particular one fulfils all possible requirements mentioned on any available SU requirements List.

What other card(s) do you recommend? I am really interested to know which one is performing well (without issues) with SU as this information was never clearly disclosed on any help files or forums! This is a very sensitive thing as this causes a lot of frustration when you do not get what is promised.

Another point of frustration is that neither the SU developers nor the Nvidia manufacturers are willing to take the responsibility and admit that "I am the one and I will do something to rectify it". So far both parties enthusiastically point fingers at one another giving excuses of driver or software faults and the final user is left with no practical solution.

Thank you for reading and please do not take it personal. I expect things to work and enhance my work flow and not slow me down and cause frustration.