Wordpress released its WP 2.6 version few weeks already. Have upgraded my some of my blog that are already running on a 2.5 version and the upgrade went smooth with no problems encountered. Since this blog is running previously at 2.2.3 and have the impression that upgrade will not create a problem on this blog, I went on, upgrade the blog and boom! No categories are working, blank page on the single post.

Going into the problem, all categories was replaced by 2,2,2 and so on. What? Luckily enough I have a back-up that will save the day by manually placing those values on categories and blogroll links. And now categories are working again and so the blogroll but what heck happened when I try to view a single post? It is blank. Nada. Have check all the files I have uploaded and seems all are fine.

Went through the theme and tried changing it to a new one, and viola! it works. Now I can see the post and pages intact.

This took me almost half a day figuring out what happened. Lesson? back-up first before upgrading. Check your theme if compatible to 2.6 version.