If you are using one of our themes and getting a fatal error message: Call to undefined function is_sticky():
Cause: You are using a version of WordPress that pre-dates sticky posts. Sticky posts are post that you stick to the front of your page so they are always on the front for as long as they stay sticky no matter how many new posts you add.
Solution: Upgrade to the latest version of WordPress or at least to Version 2.7. Versions earlier than 2.7 do not support sticky posts.