Lorel - 1:28 am on Nov 30, 2012 (gmt 0)
I've noticed those pages where I copied the title into the H1 tag also didn't recuperate until I changed the words around in the later.
Are you saying that your document title & H1 for a given page used to be the same, but the rankings recovered once you made them different?
I only change the title when absolutely necessary as this can slow down ranking for the page while it's being reindexed. I change the H1 tag instead.