There appears to be an occasional caching issue at Yuku. Your post may seem to go through, and then disappear again. You may also see a topic and get an "oops" page when you click on the topic. Please do not re-post your question. Once the caching issue is over, all posts will show up.
Today I had problems with my post showing up, disappearing, showing up and disappearing. Also when I click on edit, two times a splash page came up asking you to join Yuku! Then it would not let me out of it. Being an admin for two other sites, this is a software issue that can be taken care of with updating.