Has anyone use CEGUI with the Ogre engine? My experience always crash on this line: FrameWindow* fWnd = (FrameWindow*) m_pGUIWinManager->createWindow("WindowsLook/FrameWindow", "testWindow");

Well if you have a reasonable development envrionment you should be able to step into the function call to get a little better look at exactly where the explosion occurs (and if you don't, there's no law against dropping debug output after every line when you're trying to find the culprit, just make sure you know how often it's flushed if it goes into a buffer :P,) but from that line of code, all I can suggest is making sure that the m_pGUIWinManager pointer is not NULL.

The crash is actually within the createWindow method. Am I missing some resources?

A. Post on the CEGUI or Ogre forums,
B. Post your CEGUI.log, if you don't jhave one you did not set up CEGUI, meaning you do not have a CEGUI instance, and do not have an OGRE rendertexture for it.