When I tried to set up webpack with the React hot loading utilities, I got it running, but was receiving this error every time a component updated:
"Update check failed" react hotloader
The fix for this seems to be upgrading to a newer set of utilities (these are being renamed/repackaged differently) from https://github.com/glenjamin/webpack-hot-middleware. Make sure to follow the example, and erase all traces of the previous implementation (it’s very easy to mix these – may be best to start over)