I seem to have a problem when viewing pictures or videos on my Samsung C650. It's only a problem for newly added folders.

When i add a new folder and copy in photos/videos, I then attempt to open the folder on the TV. there is a long delay of about 30-50seconds then the folder is shown but with no thumbs. (this is normal for new folders but only the first time on open since the thumbs are created).
But now every time i open the folder, the same thing happens; a long pause and then no thumbs. The files play when selected.

I have opened Mezzmo on the server and can see the thumbs are not created.

Thanks.,

Gus