Can't initiate network game between mac and windows builds

So, here’s what I’m doing - you can tell me if anything in particular is wrong in my process (although I believe it to be correct):

  1. Commit all my changes to our version control system
  2. On my windows and mac build machines, pull down latest from version control
  3. Ensure both systems are set to ‘Development’ and that ‘Full Rebuild’ is checked in packaging settings
  4. Run ‘package project’ on each machine and wait until builds are complete
  5. Run both builds and perform network test

Running through these steps I still see error. Is there another process I should be doing to ensure parity in content across builds?