If the posters still display in Mezzmo in the Application then it could be a problem with transcoded files, try going to 'Media Devices' and double click the device in the list then on the Transcoding tab click the button to delete transcoded files then see if this resolves the problem. Please also make sure the device profile for the PC is set to Kodi in 'Media Devices' and if it is not then double-click the device and change the profile to Kodi.
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