well can't speak for linux, but in the 64 bit windows case I'd be trying "run as administrator" + re checking all access permissions for calibre data locations + re-testing with all AV, anti-adware/spyware etc turned off. It's been established that the image date is there so no dded to workout whether can't find it or whether program is not allowed to access it - or, more likely not allowed to access the database file that points to it.
I'd also look at AV history to see if has quietly quarantined anything recently.
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