This problem start with version 3.1.1 and after it started we upgraded to 3.1.2 but the problem persisted.
Our site was hacked and a single link was added to each one of our blog posts. We removed each link manually only to have them return the next day. This cycle has reaccured over the past 3 days even after doing and upgrade to the new version.
None of the static pages were effected, only the blog page.
We have shut down our blog until we can find a resolution. Any help would be appreciated.