Try looking in the Cruciates section as that is where many of the ACL threads are.
If you contributed to any of the threads you are looking for you can either click on "Show new replies to your posts" which is at the top and in the middle of the page next to your profile name. Or you can look at your profile and then click through all the messages you have sent recently to see if you come to the thread you are looking for.
Good luck - searching can be a nightmare if you cannot remember too much about who or what was being posted!
