The new ones up there have no security at all so that isn't the problem.
Are you using Acrobat reader version 6?
Can you right-click and download them, then open them from your hard drive?
Do you have the Acrobat plugin installed for your browser... i.e. can you normally open PDFs directly in your browser to view them or do you always have to open them separately in the Acrobat reader?
In the meantime I will email you the two latest versions, if that is OK.
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