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Works for me.
Check Preferences->Look and feel->Book details - is Show cover checked (it's the first setting)?
PDFs don't have designated covers as such. Calibre extracts the first page and uses it to create a cover.jpg in the book folder, this is what gets displayed in Book details… is it there?
If it's not try adding a PDF after restarting calibre with no plugins… there's an option in Preferences drop down. If that works you should be able to figure out which plugin is creating the problem
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