Posters

I've been using Serviio for about 6-8 months and it has worked very, very well. For some reason, I have two series that I cannot get the posters to show. Serviio has found all the information from TVDB.org without issue. I've tried saving a cover.jpg, a poster.jpg as well as the series name (Longmire.jpg) into both the main folder and subfolder. I've rebooted and refreshed the metadata. This also happens for another series as well.

The folder structure is :

Longmire
-- Season 2
---Files

Can someone give some pointers were to look?

Shawn Way