Thumbnail Colors & Metadata Revisited

[Darius1968]

I posted earlier about the metadata panel not making available 'date modified', 'date created', etc.  I've found this is intermittent and not on every single folder, however, all file in the database are scanned with the same metadata parameters, and where data is not available in IMatch, it is available via 'Windows Explorer".

By looking at my attachment, one can see an unselected thumbnails reveals a color background that fades from light-to-dark.  What setting is causing this, and how can I revert it to a single color? 

[attachment deleted by admin]

[BenAW]

By looking at my attachment, one can see an unselected thumbnails reveals a color background that fades from light-to-dark.  What setting is causing this, and how can I revert it to a single color?

In the File Window Layout Editor select the effected layout, under the first header "Settings" you'll find "Panel Background"