Thumbnail Refresh after removing path substitution

The thumbnails for my Tv Shows are not appearing after I removed the path substitution. I was previously using path sub on Eden and when I upgraded to Frodo, the thumbnails were working. I then following instructions on Wiki to remove the path sub lines from the advancedsettings on my clients. The thumbnails for my Movies is working but not for the TV Shows.

Can I force a refresh by deleting the Textures13 db file and Thumbnail directory from all my clients?

I'm using 2 IPADS and one Arctic OpenElec client.

My filename is <episodename>.tbn

Thank you.