Came here to say that I also ran into the same blank page issue when trying to use reaction for the first time. No combination of reaction pull, meteor npm install, blasting .meteor directory and re-cloning reaction was working. Browser console had a lot errors, i.e. Error: Cannot find module 'bunyan-format/package.json', TypeError: Package["reactioncommerce:reaction-logger"] is undefined, etc. For some reason though sudo reaction install seems to be working perfectly.