The scenery is not compatible with DX10 (although at day there shouldn't be specific issues). Yes, this has been discussed already, the web page is wrong saying it's compatible with DX10, and we are going to correct it.
We are also working on a fix for texture bleeding, which I can't reproduce in FSX though (in DX9, with no addons for the area installed).
Does this problem appears only when approaching but not when departing from Lihue. If yes, then we are working on it.