Peter,
you will need to update to 2.5.1 which is free for 2.5 users. You will also need the new TransDEM T:ANE ground textures, a separate update. This will enable you to create TransDEM routes that can be imported by T:ANE Content Manager. (The other way round, T:ANE routes back into TransDEM, will require TransDEM 2.6 which is still in the making.)
Both updates are available on my
website, in the download section.
See also this hint if you are confronted with blueish lighting in T:ANE Surveyor:
viewtopic.php?f=6&t=366