[scudlee]

In terms of renaming, I recommend using the AniDB client (for fansubs). The first post contains a link to rules that will automatically sort and rename everything to work perfectly with the scraper and the custom regexps.

I imagine the One Piece situation is just due to the sheer volume of episodes. The scraper need to generate an entire episode list (~650 episodes including specials/OPs/EDs/etc.) whenever it detects new files, in order to match them correctly.