Maximum allowed playlists/folders on Boxee Box

[Halvliter]

I have a lot of playlists on Spotify. I sort them alphabetically in folders named "ABC", "DEF", etc. The problem I'm having is that the playlists in the end of the alphabet does not show on Boxee box. I tried renaming the folders "ABCD", "EFGH" in folders of 4 letters, but that didn't help. I have tried adding playlists in the other folders, and sometimes I succeed, and sometimes I don't. 

How often does it update the playlists ?