Run meteor update to upgrade to 0.5.4 , which should fix it. See below to understand what is wrong.
It was a regression in Meteor 0.5.3. In development mode, Meteor executes ps to find out if there is an existing mongod to kill before launching the new mongod . When creating an unrelated patch, I added some erroneous error checking to see that ps printing something standard error. Unfortunately, in OSX Mountain Lion, if DYLD_LIBRARY_PATH (or several other environment variables starting with DYLD or LD_LIBRARY_PATH ), then running ps displays a warning on stderr, as a result of which Meteor 0.5.3 considers ps . I fixed this and released a fix in Meteor 0.5.4, thanks to this stack overflow question.
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