heathrow pro recognized as diffrent airport?

[Dutch64]

It might also have to do with some double afcad files. Your addon scenery will most likely install an afcad file but won't remove the original afcad
file which might cause this. I had a similar issue with other airports. I've found out that in my pc besides the addon afcad files, also utlimate
traffic's afcad files where in place. I removed those ones and didn't had much troubles anymore (except for EHAM but that seems to be difficult to get
it working )
You can also use some software (freeware) called scanafd i think, you can find it on avsim, it will scan and detect duplicate afcad files.

Hope this helps

Martin