comments awaiting moderation are displayed in the list of comments only for the person that posted the comment along with some text stating that it is awaiting moderation. The problem is the logic used to determine if the current visitor is the author of the comment... the only check is that the name and email address cookies coming from the browser match those on the comment. Users that are logged in, but do not have the name and email cookies set will be unable to view their unmoderated comments.
The attached patch will allow logged in users view their comments awaiting moderation. There is a TODO in the code to use the API instead of raw selects... perhaps that does need to be done at some point, but this at least addresses the short term.