I decided to try RootsMagic7 as an alternative to Family Tree Maker 2014 so following the intructions I exported my file to a GEDCOM and imported into a new tree in RootsMagic. Everything appeared to work until I noticed I was missing parts of my tree. When searching for the 'missing' individuals I found them in the tree but not linked to the descendants.
I then exported just that portion of the original tree and imported into a new tree. This time it appeared to work.
As my FTM tree has over 3000 individuals how can I be sure there are not other failures in the import?