Don't know where to start to figure out this problem with a wordpress post. No other posts are affected and there's nothing strange in the written content of the post...it was manually created unlike the rest of the content on the site which is automatically generated via RSS??
Based on the other pages, it seems like the #sidebar should be inside #wrapper, but on this page it is not. Probably a rougue closing tag somewhere it shouldn't be...
Using wordpress is making this problem impossible to find, there's too many includes and dynamic stuff to nail down a rogue unclosed element :(
That's not true, that's a total cop-out. :)
Make use of the W3C HTML Validation tool and you can EASILY track down any HTML errors.
I WAS using a validation tool and the line numbers they gave weren't matching the lines in my HTML editor!?
Anyway, got it sorted through old fashioned fault finding...there were php "if" and "else" statements redirecting to broken css for all non RSS generated content.