A big hello and small problem!

Mar 19, 2009
Hi guys!
My first post and Thanks to all for a great forum. Lots of helpful info for BTB.
Also Thanks to Brendon for the excellent additions to BTB.
I'm now using v6.5, and today I have tried to resize one of my tracks.
I have done this successfully previously so not sure if it's something I've missed or 6.5. The tree walls haven't updated with the resize, see pic.
Any help greatly appreciated.
It is a real rd but felt it was too tight and slow for sim fun, so I decided to try and stretch the corners out a bit. I went from 3.9 k's to 7k's to do a test but, this has happened.
Thanks in advance!:)