Hi,
I've installed the latest (2.3.0) version and it appears that the serve live reload doesn't work anymore.
After a downgrade to the 2.0.0 version, the live reload is working back again (I've used gitbook version:install to install the version, and modified the book.json file to specify the version).
I've tried to "bisect" it a bit and it looks like the last working version is: 2.0.1, so it seems that the live reload stops working as of v2.0.2.
Hope this helps solving the problem (if it's a bug, it might come from my setup).