Update page breaks permalinks

I had tested it with all plugins off, and just as I was about to swap to 2011 I looked over all my custom taxonomies, which I coincidentally added around the 3.2.1 update. Lo and behold – I had foolishly added a ‘year’ taxonomy, changing that to ‘show-year’ seems to have licked it. Foolish mistake, thanks for the interest toscho. –