I'm running P3DV3.4, had KLAS installed for over a year with no issues other than some misplaced taxiway signs. Recently I bought FSDT KFLL and once installed, problems - grass, taxiway and some runway textures would grey out on final approach regardless of aircraft beginning about 200 ft AGL - by the time I landed, they were all grey. Departing from the airport this doesn't happen. Then, a flight to KLAS showed taxiway signs, some runway markings and a layer of God knows what floating above the airport a few hundred feet above the rest of the scenery. Uninstalling/reinstalling KLAS did not fix the issue so I uninstalled KFLL, then tried to do the same for KLAS. Default scenery is now there again but EVERY TIME i fire up P3D I get a message stating that add-on scenery for KLAS cannot be found. I did the uninstall through control panel, deactivated it through Add-On mgr ...nope, still get that message regardless. Moreover, KLAS still sits numero uno in my scenery list, only its greyed out so I can't click on it, move it, delete it - it just sits there. I've since uninstalled Add-on Mgr and anything and everything associated with FSDT, including GSX - clicked on REMOVE for the add-on mgr and STILL that startup message about KLAS scenery remains. I've looked through P3D files (to the extent that I can), through Admin appdata, anything i can think of but this virus-like program will NOT go away. KFLL is gone, GSX gone, menus for add-on mgr in P3D gone, airport scenery/buildings for KLAS gone BUT the sim still seems to think its there somewhere. I'm not a programmer but I have NEVER had an issue with an add-on scenery like this - please respond.