Regular taint is (usually) fine. Whenever an addon touches a secure part of Blizzard's code (even just a variable), it "taints" it - meaning it's no longer pure. But the "Interface action blocked" messages mean that the taint is severe enough to actually prevent the default UI from doing something or, like Arrowmaster said, the addon is trying to do something that it is not allowed to do. These messages usually pop up in combat, when the default UI locks down and is more restrictive.
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh
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