TeMerc's blogspot reports:
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MessengerPlus: Now Includes Rogue & Adult Content
temerc.blogspot

Sandi's Site has an update posted on the new version of Messenger Plus!
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Messenger Plus version 3.63 introduced a new version of the Sponsor Program. The toolbar is gone, the pass through bar is gone, and the home page is no longer changed to a URL owned by C2Media (commonly known as Lop.com) - instead, we're honored to see popup windows that now try to install various activex controls on our PC, including one product that is known to use rootkits - malware anyone?
inetexplorer.mvps.org

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The Sponsor Program deliberately bypasses XPSP2's pop-up blocker; it removes protective entries from HOSTS files, it *may* edit your firewall settings to grant itself unfettered access to and from the net (blocked on my system by Group Policy). Older, vulnerable operating systems, or systems running with lowered security settings, will be infected with additional malware products automatically. You won't just get the "Sponsor", you'll get the Sponsor and lots of other crap.
msmvps.com/blogs

Edit: Patchou (Messenger Plus! Creator) responds to critics:
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If your kid is not capable of installing software then he shouldn't be using an account on Windows that lets you do so.

For the record, the AdultFinder ads are not supposed to be there and will be removed tomorrow. ErrorSafe is already gone (it happens from time to time and that kind of advertiser is immediately banned for life from the system when detected).
msghelp.net