If you created a thread, and can't find it under the topic you created it in, then that would typically indicate that the thread has been moved to a different topic in the forums.
In a collaborative effort to promote and maintain efficiency of the forums, some threads are moved to a topic that is more relavent to your thread, allowing users to find information pertanent to topic it was originally created in.
When a thread is moved, you will recieve an automated e-mail regarding this.
If you have any questions regarding this, please contact myself or any other moderator.
Thanks,
Justin