You must use a "\" before your quotation marks in your phpinclude template.
Copy and paste the following in it's place.
Code:
// Show User CP or Register
if ($bbuserinfo[usergroupid]==1) { // Non-Registered
$register = "<a href=\"http://www.mydomain.com/forum/register.php?s=Array%5Bsessionhash%5D&action=signup\">Register</a>";
} else { //Everyone else/Registered users
$register = "<a href=\"http://www.mydomain.com/forum/usercp.php?s=Array%5Bsessionhash%5D\">Profile</a>";
}
//End Show User CP or Register Code