Got a strange issue developed on one of my sites. Clicking on "Older Posts" of a Category Archive returns an error 404, and goes on to search for "2". This does not occur on a Tag Archive or Blog Posts.
Enabling "Infinite Scroll" on the Category Archive returns a similar issue, "Fetching 10 more items of 26 left" but no additional Posts are displayed.
Since this error developed I have upgraded to Graphene 1.9.2 and WordPress 3.6.1 but the issue remains.
Tried everything I can think of without success. Would appreciate any suggestions on how I can resolve this issue.