Are they frozen?  Actually, this has been discussed. If I remember correctly you need to cycle them several times and all should be well. That happened to me after a car wash attendant pushed them shut. Here are a couple of threads on "timing". Hopefully it is not this.
http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=697601368 1&r=5096013681#5096013681
http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=304605736 1&r=3046057361#3046057361
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"My reading of history convinces me that most bad government results from too much government."---Thomas Jefferson
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