Here’s a BIG problem with WordPress 2.5 and 2.6 that might ruin your blog.
Permalinks may fail. With my specific theme I got an error that said “Sorry the tags had been deleted “. You may see a different error.
The reason for this was because the WordPress PHP function “have_posts()” was returning nothing.
I am not sure why that fails (I’m a .Net guy not PHP) but here is how I fixed it.
Some of your links to your categories and tags may be changed, but this should work for you.
You may have to hit ctrl-F5 on each page to reload it correctly.
If you’re not having problems with this, then you can ignore this post.