I just bought my first Le Creuset pot last year. (The big oval one, very nice shape. Perfect for an entire chicken.)
Anyhow, the product literature warns against sudden changes in temperature that may crack the enamel. Throwing a hot pot into a sink full of cold dishwater is definitely a no-no.
Yet, de-glazing a pan with a splash of something is essential after browning stuff. Is there risk of cracking the enamel?