Tuesday morning, THE WEEKLY STANDARD  reported that the doctor search feature on the Maryland Health Connection Obamacare insurance exchange was not yet operational and returned a "no doctors are found" message.  A reader from Minnesota points out that  MNsure, the Minnesota exchange, has not yet activated a provider search feature either, and provided a screen grab from the site:

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The  MNsure site notes that it is still undergoing regular maintenance:

Account and application system is available Monday –Saturday, 6 am – 10 pm.

System maintenance is performed Monday – Saturday, 10 pm – 6 am, and all day Sunday.