I have a Feature that provisions master pages and page layouts along
with matching site columns and contents types to a site collection.

I then use these page layouts to create a number of pages in a site and
fill them with text and images.

Next I need to push out a redesign of a page layout and am trying to do
this using solution upgrades by building a new solution.wsp file
containing the feature with the updated page layout, and then using
stsadm -o upgradesolution to push the change out.

I have tried iisreset and reactivated the Feature, but the page layout
remains unchanged in the master page gallery. Further, I have
AlwaysForceInstall="TRUE" on my Feature and
IgnoreIfAlreadyExists="TRUE" on my provisioned File.

What am I missing?