Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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I have ffp installed on my dns-323 (for a very long time now) but I am just looking at setting up the samba server using the dlink gui.
However, I can't see new groups in the gui when they are added. I have checked the group file by mounting the firmware (same file as in /etc/group - how does that work?) and I can see the new groups I added just fine.
I'm assuming that something has been set in my groups file that the dlink gui doesn't like... so how to fix that?
root:x:0:root allaccount:x:100:user,names 500:x:500:admin 501:x:501:nobody sshd::33:sshd www-data:x:1000: network:x:1001: poodoo:x:1002: donut:x:1003: utmp:x:22: test:x:1004:
OK, I fixed it.
At some point I must have created a user called www-data using useradd (or similar) rather than the web interface (gui). This gave it a uid of 1000, and hence a primary GID was created with 1000 too. That got rewritten to flash.
I guess the dlink gui somehow looks at the last created GID when it adds a new group (hence my test groups above are all 100?) but it's actually looking for groups with GIDs in a certain range to display (hence it warns you can only add 10 groups in the gui). Therefore these high GID groups weren't visible in the gui.
What I think THEN happened was I created new users in the gui and their UIDs collided with existing GIDs...
To fix it I added all the existing users to the umtp group using the gui. Then using the command line I deleted all the 100? groups and flashed that using the store-passwd.sh script.