Hi S --
Try this tip --
1. Save route onto CPD via CMP+
2. Now go into trainz -- create a new route
3. Now you have a blank board - So do this, select the option to merge route
4. What you are doing now is merging that route to your new route (blank board) --
What happened to you happened to me a long time ago, and this is how I fix it -- Hopefully it works for you as well...
Also, saving the cdp will give you the chance, if all fails, to delete the route from trainz, and re-installed it!
And lastly, if that fails too, I strongly recommend sending the cdp to a friend, let them install it ... to see what happens -- if it works for them they can save it, and send it to you, maybe under a different name!
Good Luck
Ish