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The affiliate link pages are in frames and are set so that it's my domain that appears in the surfer's window when the merchant's affiliate/product page is loaded.
A few days after these pages were uploaded, Google turns up as usual to visit my site (actually, he'd been pretty late). A day later, my PR starts fluctuating between it's established PR3 and PRO. This continues for 24 hours or so.
Today, it seems to be consistently PR0 on all but a few very minor pages, which have PR1.
Have I upset Google with these framed affilate link pages?