Multifile not finding subfile

My mf won’t find some subfiles with mf.findSubfile, however they are there when I do multify -tvf!!
I know it is too little info, but it’s the problem I am having!

Thanks!

Try this:

for name in mf.getSubfileNames():
    print name

This will help you to find out if you’re even passing the right string to findSubfile.