I installed Greg's High Performance SEO for my website, and everything worked fine (great, in fact) except when I clicked on individual posts. On individual post pages that had been published since I installed Greg's plugin, my "Similar Posts" plugin content and Twitter button would appear above my blog's header image. I tried uninstalling and then reinstalling the plugins involved, and the issue definitely lies with this plugin -- the only time I have the issue is when it's activated. Any ideas as to what could be the issue? For now, I unfortunately have to leave Greg's SEO disabled.