Hi,
Thanks for the response.
Just downloaded a new WB install although it said it was the trail copy so I hope it picks up my licence.
Have just unloaded WB and the problem is still there...
Go into a folder & set the icons to medium, go backup a level then back to the folder - all ok.
Go into a folder & set the icons to large/extra large, go backup a level then back to the folder - no thumbnails displayed.
I've cleared the thumbnail cache out using disk cleanup and will try a reboot now.
Dave