the only issue i see on he original registration page is the location of the connection require once line, it should be moved to line 1 so the connection is defined before the check new user name function.
For the login issue, are you testing remotely or locally?
If testing remotely, make sure that the WA_SecurityAssist folder is being uploaded to the server. If you are still having a problem, add the following code after the body tag on the profile page so i can see the sessions being set:
<?php var_dump($_SESSION); ?>
and send a copy of the WA_SecurityAssist/HelperGroupRules.php page.
I've tried testing on Windows 7, Vista and Mac OS using Security Assist 1.1.8 and 1.1.9 in DWCS4 and DWCS5 and i cannot recreate the issue you are reporting. I tested both before and after installing EC5 and DA2.
