arghh mea culpa, it works for me but not in usual conditions :
i had an old .ioftpd file at the root of my system.
I didn't pay attention
It's not a regular way but if you want your normal users have list on root you must make a .ioftpd file on it.
How to make it ?
Make a dir with your normal user at root, inside this directory a .ioftpd file will be created then copy it on the root, refresh listing with your normal user and now you can see the list. I assume it's not a normal way and it may cause other incidences (only Darkone know it cause .ioftpd file has a strange format).
I haven't better way, waiting for a strong fix.