i don't think "blocking bugs" necessarily equates to "preventing cookie creation".
what may be the case (just guessing) is that Ghostery blocks those beacons from receiving any data. [i.e., requesting some file be created and actually accessing that file are two different deals.]
if e-mails don't work try posting on their facebook page.
Thanks; that sounds like a good guess.
(I don't do Facebook... Oh, well.)
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In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire