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I see individual cookies (hundreds, ouch!) but there is no way to examine the contents. I do have one for pgmusic.com but there is no cookie resembling v7ubbt_myid.


It is only showing you the sites that have cookies, not the individual cookies for each site. There may be a way to view individual cookies but I haven't tried it:
http://apple.stackexchange.com/questions/75178/how-can-you-see-the-value-of-a-cookie-on-an-iphone

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In the same area, I do have a setting for cookies blocked from third parties and advertisers


Right, that setting should not cause a problem, and doesn't in my testing.

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If cookies were blocked, would the site remember my data when I enter as little as the first letter of my username?


It is not the site that is remembering this, it is Safari remembering form data.


Andrew
PG Music Inc.