Movie/TV Posters aren't working with Library view | File view OK

For some reason the movie and tv posters don't show up while I'm browsing in Library mode. If I go to file view, they show up fine.

In the library movies section - XBMC is extracting a random thumbnail, while the TV section displays the normal folder icon.

I use Media Companion to scrape all the info.

I'm using a mysql database on a homeserver for my library & the same server is hosting all my video.

I'm using the latest stable iOS build and the default skin (I think it's called Confluence).

I've tried cleaning the database, removing the source and re-adding (the correct content of the source is selected)...

Anyone out there able to help?

Thanks in advance,

W.