This may not have to do with safe_mode but when I try and register for an account with thesteamertrunk.com I get the following error upon submission:

Warning: Invalid argument supplied for foreach() in /home/httpd/vhosts/thesteamertrunk.com/httpdocs/shop/var/run/modules/Newsletters/view/RegisterForm.php on line 73

Warning: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/thesteamertrunk.com/httpdocs/shop/var/run/modules/Newsletters/view/RegisterForm.php:73) in /home/httpd/vhosts/thesteamertrunk.com/httpdocs/shop/var/run/base/Dialog.php on line 235

After I fill in the registration info, and unclicked the newsletter box, I received the error above.