In fact, it is just the subdirs in the fids folders that are causing the problem.

empeg:/empeg# ll fids?/
fids0/:
total 2
drwxrwsr-x 2 root 60 1024 Mar 7 01:07 _00000
drwxrwsr-x 2 root 60 1024 Mar 7 01:12 _0a2c2

fids1/:
total 2
drwxrwsr-x 2 root 60 1024 Mar 7 01:08 _00000
drwxrwsr-x 2 root 60 1024 Mar 7 01:12 _0a1c2

I am putting all the files into such subdirs just like fidsift does (at least I hope I'm doing it right) and with just these, i.e. with or without any files in them the player has this memory problem.

Is there something else that needs to be done to let the player know it should be using these 'fidsifted' directories?