lucy24 - 6:58 pm on Jul 4, 2011 (gmt 0)
Is it just the one page or your whole site? Does it show up normally if you browse it yourself? I just tried a couple pages of mine with no issues. (And what do they mean "May take a few minutes"? All the googlebots are on break but they'll get to it when they come back?) Can you look at the HEAD by itself? I thought there was a way to get at it in GWT, but can't find it now.
Er, google, those are not "duplicate title tags", they are the same page and you know it because the old page has been 301'd from the moment I made the change. Not one second of overlap. Sheesh.