If it is associated with device resolution then have you experimented with the columns/thumbnail resolution settings and did any changes make a difference ?
Main Menu>Preferences>Library>'Thumbnail Resolution' and 'Thumbnail columns.'
Check their individual help icons for details and method.
Also to note that there is a Thumbnail cache regeneration setting Main Menu>Configure>Library>
Main Menu>Preferences>Library>'Thumbnail Resolution' and 'Thumbnail columns.'
Check their individual help icons for details and method.
Also to note that there is a Thumbnail cache regeneration setting Main Menu>Configure>Library>
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bob
bob
