headers already sent ERROR when I activate AutoMessage 2.0.2

Running WP v3.0.5 with BP v1.2.8 on WPMU network at psek.

using bp-social-child v1.2.2

From the Register-now page, when it goes to step 2 (select a subscription) I get this error:

Warning: Cannot modify header information - headers already sent by (output started at /home/racreprt/public_html/wp-content/themes/bp-social/header.php:2) in /home/racreprt/public_html/wp-includes/pluggable.php on line 897

If I disable JUST the AutoMessage plugin, it all works fine...