We are running DT Register 2.7.0g on a Joomla 1.5.22 install and are having a problem with the {GROUP_MEMBER} {/GROUP_MEMBER} email tags.
We have the following syntax in the Custom Thank You Email message but it only generates some white space in the email. No data is pulled for any group members.
Seems this is a problem only with custom thank you emails. When using the global thank you email, it seems fine. This is on the list for fixing for the next build update.