ErrorMessage: Mode not supported by hardware

[griff]

hi to all. maybe somebody can help me (:
i HAD an application using LWJGL running and all was fine.
then i installed the latest ATI Radeon driver for my graphics card and from that moment every time i tried to create a Window the following message appeared:

org.lwjgl.LWJGLException: Mode not supported by hardware
   at org.lwjgl.opengl.Window.nCreate(Native Method)
   at org.lwjgl.opengl.Window.createWindow(Unknown Source)
   at org.lwjgl.opengl.Window.create(Unknown Source)
   at org.lwjgl.opengl.Window.create(Unknown Source)

but my hardware hasn't changed.
Btw: how should a Window be created? In the javadoc there is a Window class with method create()... but i read something about that from now on the Display class merges the functionality of the former Display and the Window class... so should from now on a Window be created with a method from Display?

Sorry if my english is bad, but i'm not used to writing other stuff than code (;.