hello Mark

the only way you can lose a post here is either if you time out (which can be avoided by checking "remember me" when you log in
or
if you did not click the submit button when trying to post. this sometimes happens if members use the Preview Post button and then forget to go further by clicking Submit

if any post is ever removed by a moderator, you would be PMd about it. No posts are ever totally deleted, and they have to be moved by the mods to the admin forum so we have a record there. There is no post by you there.

hope that may provide an answer to your mystery of a missing post.