I just discovered that, when I switched to MT 3.2, the wonderfully designed upgrade system kept all of my MT 3.17 templates. I can understand the reasoning behind it – that people who have spent ages customising their HTML will not want it overwritten – but there is one minor problem with this: MT 3.17 templates are incompatible with the new version, the template structure has changed completely! This is what caused some of the strangeness you might have noticed – such as comments having no discernible start and end points, archive pages leaking into the coloured background etc. I had to go through every in-use template (removing anything wrapped in the MT_TRANS function which doesn’t actually seem to work at all) and copy-paste the MT 3.2 version from my downloaded ZIP file, but it’s done now and it should work fine.