Since upgrading to Mavericks, Safari/Adobe are constantly blocking access to PDF files

Since upgrading to Mavericks, Safari/Adobe (Version 7.0 (9537.71)) are constantly blocking access to PDF files.

I can intuit what this is all about, however, I can find no information about it... the Adobe Plugin/Safari is apparently building a "white-list" of "trusted sites," but I can not find any information about this white-list -- where it is stored, how to revoke permisions, how to "one-time" permissions, etc.

Anyone have any ideas?