They're all using Following setup:
Dell Lattitude E5530
Samsung SyncMaster S24C450
02AA Targus Docking Station With Video USB 2.0 MODEL: ACP51EUZ
The Targus Displaylink, is connected directly.
The only difference from the office PC's to those we're setting up now, is that they use a converter from DVI to VGA cable.
So we have no clue why this bug occur.
By the way, i've tried using both the windows update driver, and the following one, same error.
Edit: I found out that the whole Box dies, and not only the display part.
Edit 2: Some of the installations causes IE to crash and being unable to start, eaven without addons.