A problem with PLSM2 demo in DirectX mode

Hi,

I tried start PLSM2 demo in DirectX mode, but I have the error:

Error #: -2147467259
Function: D3D9RenderSystem::_render
Description: Failed to DrawPrimitive : An undetermined error occurred.
File: ..\src\OgreD3D9RenderSystem.cpp
Line: 2464
Stack unwinding: <<beginning of stack>>


In the OpenGL mode it's works correctly.

These are the properties of the PC:
CPU - AMD 64 3500+
Video - Nvidia GeForce 6600 - 256Mb, video drivers was updated.

Thanks and regards,
Alex

need more infos there :

CVS or SDK ?
Ogre Version ?
Terrain used ?
vanilla demo ?