CacheTrack Version Confusion 
Since November 11th Groundspeak is using the old GPX format again. (see
http://forums.groundspeak.com/GC/index.php?showtopic=235742 ). Because of that version 1.10 of CacheTrack can't be used for GPX files downloaded after that date.
So my advice is to use 1.9 again. The next version will be more agnostic regarding the differences between these two formats.