Can you use multiple Philips 221SU3 screens on a single computer

[pmo_ney]

All,

After reading up on the Dsplaylink technology and seeing that up to 6 adaptors are supported I ordered 3 Phillips 21" Displaylink monitors.
If I hook up more than one all screens keep flashing.

I also have a separate adapter and a Toshiba portable displaylink screen.
When i add those together with 1 Phillips screen all goes well.

I've already updated both the displaylink drivers and the nvidia drivers to the latest versions, I'm running windows 7 64bit.

Trying it on two different laptops gives identical issues

Could it be that the Phillips screens are conflicting with each other ?

Tnx in advance,

Peter