Permissions for Serviio without root
I've run Serviio before as root, and now when I start the service as normal user, I can't play anything (I get "file not supported" error for every file). Everything works, when I start serviio as root. I guess when I first ran serviio as root, I changed permissions for some files, and now I can't reach the database files without superuser permissions. My question is, which are the files I need to change the permissions for, and what permissions should I use? I'm using Kubuntu.
Thanks.