Serious Problem at KDAL in Dallas, TX

I have a similar thread running in the MS Scenery forum but tonight I discovered a new problem and I want to see if it ORBX and the KDAL airport addon I am using are fighting for supreme control of the FSX universe.

Problem:   Ever since I installed Doug Adkins's KDAL v1.5b there has been a problem with the airport at the Northwest end of the airport where Bachman Lake is located, right at the end of 31L/31R.    When I take off in that direction shortly after lift off at that end of the airport the game freezes for 2 seconds then comes back to life.   The lake turns white and all the ORBX textures around the lake turn black for a second then all the textures are restored and REX's lake textures and wave animations return and the simulation returns to normal.  It is a very annoying problem though.

Here is the horrible additional problem.   Even after uninstall, this freeze is now there.. forever.    There doesn't appear to be any files left over in the FSX directory regarding the KDAL airport but the freeze and texture blackening is permanent.   

Here is the new problem I discovered today... when landing on 13R tonight (my first time to be back at the airport since I left 2 weeks ago.  I fly airport to airport in sequence) as I was on the final, about 200 feet from touchdown, over Bachman Lake... my plane exploded and 108 passengers died a violent and sudden death.   CRASH DETECTED!     My jaw hit the floor in disbelief.   A two our flight.. ending in a CRASH...  over the very lake of doom.

I read in the Readme file for the KDAL addon that the author has added a landclass around the lake in his latest version.    Is it possible that ORBX and this add-on are at odds with each other?    Why is this problem happening even after uninstall?    Are there cache files left behind that I am missing to revert the KDAL area back to default FSX values?    It has taken me forever to get my FSX stable and running smooth and I am not looking forward to a complete uninstall for the 7th time just to get this crash and freeze out of my life...   :(   I really like Doug's version of KDAL.   All the buildings are where they should be but his install is certainly conflicting with something.   This wouldn't be a major problem if KDAL wasn't my home port.   I fly out of there all the time.

Of note also, I have FS Global Ultimate doing my terrain mesh if that means anything.    Any ideas out there?   Thanks.