Thank you all so much for the replies and help.
My working settings (which I prefer to have) are: Antialiasing at 4x,
Sky turned on. I like to see the model with smooth edges even when I
work. That is one of the reasons that I bought the card for.
My operating system is Windows XP - SP2. My card is Geforce 8600 GT 512 MB
DDR2, supporting Direct X 10.
My computer is a Desktop Pentium Core2 Duo - 1.8 GHZ, with 2 GB DDR2 RAM
and with a 17 inches (4:3) Flat panel LCD monitor.
In fact I am now becoming contended with the work-around. I have disabled
floating toolbars - have only docked toolbars. Turn the sky off and have a blue
background instead. With these SU is working quite fine. I find SU quite
fast with this card (I have been without any add-on graphics card for so long
- so the difference I see is quite amazing).
I did not and still do not want to put money in expensive graphics cards like
Quadro FX series. This card is working fine with AutoCAD and 3ds Max also.
But I am really not bothered about with AutoCAD and 3ds Max. I primarily prefer
to work with SketchUP for conceptual 3d.
Thanks again
With best regards
PRSS
P.S.
By the way, the problem with the Quicktime movie was accidentally solved
by me. If I open 2 Quicktime movie windows simultaneously, it works. If
I close the first window both windows close. Funny behaviour - but it
is atleast working!