Hi, thanks for a great project!
Using "Starter PubCollab.master" on an MDS-enabled site breaks the MDS (Minimal Download Strategy). I went through the master page and commented out sections until it started working again, and the issue is with the line:
<!-- ===== STARTER: Ribbon Code Starts Here ========== -->
<PublishingRibbon:PublishingRibbon runat="server" />
AFAIK the PublishingRibbon control is not MDS compatible (and it's not used by Seattle.master).