It is something more obscure than that.
I have tried running procmon in parallel when these symptoms occur. It definitely looks as though something is blocking Windows Explorer.
I normally have Recycle bin disabled, and I have tested with Virus checking on/off and it makes no difference. The calibre folders have already been excluded explicitly in the Virus checker as well.
I can live with the issue easily enough, but I thought it was worth bringing up in case it sparked a thought in someone's mind. I may find the time to run a much more detailed analysis of all what is running under the covers and track all calls to the system but the amount of diagnostic information one has to wade through to get to the bottom of such issues is a none-trivial task.
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