I just upgraded from FM13A to FM16A and have noticed a behavior change. This may have been appeared in version 14 or 15 but since I skipped those I didn't notice.
Basically, in version 13 when using Insert File within a script I was able to provide the path to the folder rather than the file itself. When the file was not found the Insert File dialog would open in the correct folder prompting the user to choose a file. Now on version 16 it throws error 100 and no dialog opens unless I have Set Error Capture [Off] and then the dialog opens in the My Documents folder.
It's not a huge problem but the behavior in version 13 was different and probably better.