A "Report to Moderator" doesn't automatically mean that the reporter(s) will receive an acknowledgement. All moderators receive a copy of the report via email from Martin, and if it is deemed that action should be taken, it is. Not all reports are considered to be worthy of action, but each report is dealt with on its merits.
As bikerdude666 pointed out, all the moderators are unpaid volunteers who devote a lot of their time to keeping Mayhem a family friendly forum, but they are unable to read every single post. The "Report to Moderator" button allows members to draw the moderators' attention to matters that the mods themselves may have missed. Even if a moderator is shown to be online, he will only see any reports when he checks his email. Time zones also have a bearing, for example, tigertiger lives in China, and I live in Australia, so it may be some time before either of us sees a report.
I hope this clarifys the situation
Peter Fitness,
Moderator.