No, thanks for thought, directory file resides on card and never a problem finding any file. Just a small inconvenience having to press the little cross at top when I don't know why. Card previously worked fine in X5 before I formatted (a few times now!).
Only problem I've had playing files is some DSD have stopped after a few seconds then play after a restart as if the processing is catching up (again no problem with same files in X5).