I was encountering orange and black "blocks" in V5 (coming out of Laguardia in pic). Rod put me onto the thread that solved the problem. There is a problem with the default "lclookup.bgl" in P3D V5/Scenery/Base. If you replace that bgl with the one that is in the attached zip folder, the problem will go away. Note that if you run a verify for Global Base, it can put the wrong one back into the folder.
Thanks, Rod
Doug