Ribbon disabled with Wiki Pages

I was recently doing another branding job for a client, using the starter master pages by Randy Drisgill, as usual. The customer started testing the newly branded environment and encountered a somewhat disturbing problem: when creating a new Wiki page to a site, the ribbon was fully disabled (except for the Site Actions menu), and the page threw a javascript error.

Checking out the problem, I found that v4.master includes three lines of code that the starter master pages don't:

Register Tagprefix="Utilities" Namespace="Microsoft.SharePoint.Utilities" Assembly="Microsoft.SharePoint, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"
Assembly Name="Microsoft.Web.CommandUI, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"
Import Namespace="Microsoft.SharePoint.ApplicationPages"

Adding these, the ribbon started acting properly on Wiki pages as well. Might be, that for this problem, the solution wouldn't have required all of the above, but I figured it wouldn't hurt having them all tag along all the same, in order to prevent other possible functional problems.