Users unable to change header image after upgrade from 13.1 to 14

I've recently noticed, that users are no longer able to update banners on my site, and I see the error "Uncaught ReferenceError: glUploader_yh4sfuZ8_bx_persons_cover_crop is not defined"

I have tried clearing the cache (Client and App) and checking for updated but still get the same issue.