It looks like the S06E11 thumb is being added to your media library:
Code:
19:41:21 T:2304 DEBUG: Mysql execute: INSERT INTO art(media_id, media_type, type, url) VALUES (1420, 'episode', 'thumb', 'smb://MYMEDIASERVER/Network F/Videos/TV Shows/Burn Notice/Season06/Burn Notice.S06E11.Desperate Measures-thumb.jpg')
However I'm not seeing anything written to your Thumbnails folder, but that could be because it's already there.
The thumb should exist in your Thumbnail folder as "Thumbnails\a\a794f8f6.jpg" - check if the file is there.
If the file isn't there, then your Textures13.db has a row which needs to be deleted because it thinks the file is there, so it isn't re-caching the new image (you should see an error in the XBMC log when trying to view this thumb which can't be found in the Thumbnails folder).
Use the
Texture Cache Maintenance utility to fix most of these problems.
Start by verifying the thumb has been added to your media libary:
Code:
texturecache.py jd tvshows "burn notice"
To automatically delete rows in the Textures13.db database that refer to non-existant thumbs:
To cache artwork for Burn Notice:
Code:
texturecache.py c tvshows "burn notice"
and to force items to be re-cached:
Code:
texturecache.py C tvshows "burn notice"
etc.