Hi,
I've created a fresh install of the eMember plugin on this test site: http://sebastianwebb.co.uk/microthemer/?page_id=8 where you can reproduce this error yourself.
The problem is, when entering a value for "Password" on the "My Profile" page I get the following error:
"Warning: Cannot modify header information - headers already sent by (output started at /home/sebastia/public_html/microthemer/wp-content/themes/twentyten/header.php:12) in /home/sebastia/public_html/microthemer/wp-includes/pluggable.php on line 720"
This happens even if I enter the original password. If I ignore the error messages, click the "My Profile" link in the main menu and update my password for a second time, the error messages don't appear (thought it might help to mention that).
Any help would be much appreciated.
Seb