All Posts show Blank - When a New Post is added

We have an internal company Intranet built in Perch Runway. It lives on a windows IIS7 server (not my choice).

Recently we noticed that when we update the blog with a new post, all posts turn blank when visited - none of the content gets displayed. Listing views show the content fine - but drilling down into the post its self returns empty content.

To get all the post views showing again we have to click save on a random post in the admin area. Sometimes this doesn't even work.

I'm not really sure where to start looking to fix the issue. Does anyone have any suggestions?

Thanks in advance,

Dan

UPDATE:

Discovered solution: Compared debug output of working and not working page. Saw that the rewrite rules were not consistent. I amended the url path for blog posts in the admin settings.