In creating my trip I stopped half way and created a KML file. All Good!. Completed the full trip, however after extracting the KML file (New file) the image only presents to the original half of the trip. Please Help
KML File
Hmm, that sounds like some sort of caching issue. The export seems to just immediately redirect to the existing output, not recognizing that it needs to generate it again. I tried forcing it to, but was unable. This'll probably need Peter (the admin) to have a look at the code. Thanks for the report!
Thanks for the update
Sorry for the delay answering. Yes, definitely a caching issue. I had a look and that export in particular has a fairly aggressive 30 day cache on it. I guess normally people are exporting when they are done and just haven't noticed the problem 
Also, it used to be able to clear the cache when saving the trip, but that code doesn't seem to be hit any more, so it just has to wait 30 days. I'll mark this as a bug to fix up.
In the short term though you can try this link to download your trip with refreshed data. It will only work for you, so be sure to login before clicking the link.