There are occasional caching issues 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 or be redirected to an unrelated Yuku page.
Please do not re-post your question. Once the caching issue is over (give it an hour or two), the post should show up. If not, hold down ctrl and F5 to refresh the page. If it still hasn't shown up, then you can repost.