Hi yes thank you step one disabling the KTIW add on allowed it to load a flight from Gower field and to function properly. It no longer crashed to desktop.
Step two I verified all Orbx files.
Step three I moved the laminar landmarks in the ini file as suggested.
Step four I reinstalled KTIW addon.
I then loaded another flight at Gower field and it did not crash, performed correctly.
Just to be sure I then loaded a flight at KTIW with the addon and it loaded the flight and performed properly.
All appears sound now. The log.txt file says a ground traffic file is missing from KTIW but I am not sure that affects anything.
In sum my issue appears to be fixed.