You’re not alone – I’m having the same problem.
I’m using the twenty ten theme and have tried disabling all plugins etc… but it makes no difference. When you click on “leave a comment” you are taken to a page with just the post and some info the post’s author but no means of leaving a comment.
I fear that whilst playing around trying to customise the site I might have removed some code from a php file. Does anyone know which file I might have altered or where to begin to look?
The site in question, if you want to see for yourself, is drivingroute66.com The posts are on the Places to Stay and Sights pages…
Steve