I'm having basically the same issue. I've included a screenshot of what it looks like after installing the demo. My X-plane graphics settings are Visual Effects - High (HDR), Textures - High, Anti-aliasing 4X SSAA, Number of World Objects Medium and Reflection Detail Low. I removed all of the plugins that I thought could be conflicting (e.g. xVision) and ran the X-plane updater to restore the default cloud files etc before installing demo. Any suggestions anyone has would be appreciated.