Grey disapearing Windows Gui problem ?

[ALISS]

So this is my last chance to get this solved ...

I´ve a big problem, if I open an Arturia plugin ive got a 50/50 chance that I can see the Gui (Graphicuserinterface).
If not I see grey/black/transparent Windows.
The bar on top I can see every time.
sometimes some parts appears like cables or some knobs.

What I did up to now:
updated every driver
updated arturia plugins
dont installed SP3 - I fear the death 
.net 1 2 3 4 installed
"automatic start" reduced to nearly nothing
/3GB switch
changed priority of programs, systemcache, backgroundprocesses

What I observed up to now:
It becomes worther the more Arturia Plugins i started.
close/reopen/hide behind other window/change colordepth or resolution has no effect.
If I switch off my second monitor it allmost gets better.
Seen the issue on Nero Gui and one time in the window display options (after problems with Arturia)
Cubase has (in a special case) 200MB ram and 100MB virtual ram - Why do cubase not use more physical ram?
Graphical issues in Cubase 4 and SX3
without graphicdriver the same appears.

System:
intel Q6600
Asus MB P35 chipset
Ati HD3600 passiv
4gig ram
Motu 828 mk3 Firewire
Win xp SP2 32bit
cubase 4

Ive got screenshots - how to insert here?

So please help me! I count on you "freaks" 

André

[ALISS]

Installed SP3 - changes nothing

I noticed, that if i change color depth to 16bit Gui works fine - up to 6 arturia plugs - dont tested more yet.
Not a solution but a hint.

André

[Denis]

Hi Aliss,

Do you face this problem using your synth in standalone mode or with a host? I would need to know which host you use.

Kind regards,

Denis