I have two N900's

Number 2, no problems whatsoever, backup regularly with BackupMenu without errors.

Number 1, for some time when attempting backup I get the following error:-
Errors: 1 Last gtar ./var/lib/dpkg/info/mafw-tracker-source.postinst: Warning: Cannot stat: Structure needs cleaning.

BackupMenu just sits there then counting up the time with no Size increase. I have to abort with the 'hold' switch..
Incidentally, fsck runs clean.

Also, if I run a 'find' from a terminal I get:-

sudo find / -name fred
find: /var/lib/dpkg/info/mafw-tracker-source.postinst: Structure needs cleaning

I have reflashed number 1 (a number of times) and restored from a backup created from number 2 but I still get the same problem!
Can anyone explain this? The problem still exists AFTER A REFLASH of both COMBINED and VANILLA!

I would dearly like to fix this.

Mystified