FWIW, there's a series of messages in one of the Amazon customer forums where someone claims that using an eyeglass cleaning wipe resolved his smudges and multicolor issues. I have lots of screen cleaning stuff at my work, and I tried several different kinds (including the packet-type wipes). No difference for my color blobs. I guess some people may really have surface oils or films that are causing some weird light diffusion, but I don't think it's the cause for the obvious pink/blue examples like mine.
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