thumbnail error

Hi, After a few days us usage (no reboot) MacOS (i assume it's a Finder-problem) seizes to display thumbnail previews... as this screenshot shows. - Relaunching Finder does not work - Reboot does work (I hate that) Question: What program do I have to kill / restart to get this working? (No OS...

Hi all, My Macbook isn't showing thumbnails, either jpeg or png - there are a couple of files on my mac which have a preview but most do not. Even downloaded files there is no preview. I have tried deleting the com.apple.plist file etc, updating the individual image in preview to try and...