Not sure I can tell you much more. Attached are the Add Books preferences I use on my 'real libraries'. I cant recall how/why I settled on these settings - but they've been working for me for a couple of years.
This morning I put 40+ articles I received over night via mail, nntp and rss into E:\Calibre Libraries\AutoAdd. Within a minute or two of starting calibre they were all in my E:\Calibre Libraries\ReceivingDock library. I do this every morning.
I'm wondering if you're running into an NTFS Permissions issue.
Or some sort of zone security barrier, look at the properties->general tab on one of the files if there's an Unblock button click it.
BR
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