ILS and Addon Scenery?

[K4]

Upon installing some addon scenery files I've found that the ILS approach no longer works correctly.

As soon as the ILS is picked the aircraft truns in the opposite direction to the runway!!!

By activating the back course this will put the aircraft on the right heading but now I've lost the Glide Slope....

Anyone know what I'm missing or doing wrong?

Many thanks of any help!

Mk4