XYplorer Beta Club

Can anyone think of a reason why XYplorer has stopped generating Photoshop thumbnails? I've tried the 'refresh thumbnails' option under View/Cache. It does show some thumbs that were created a while ago, so could it be due to a recent Photoshop upgrade? TIFFs, NEFs and JPGs are all OK.

All OK again now. I'd somehow lost the .NEF.CPT.PSD. extensions from my config file.