Quote Originally Posted by kagaroo View Post
Just fresh install zc 1.51 version on my server and test as frank18 suggested. Yes, no problem, I can log in without any problem.
... as predicted

Quote Originally Posted by kagaroo View Post
For my site, it was originally for the zc 1.38 and recently upgraded to zc 1.51. It was running smoothly on php 5.2 or 5.3. but not on php5.4.

When switch to php5.4, there two files seems to have problem when customers try to log in.
includes/functions/html_output.php on line 77
includes/classes/seo.url.php on line 215

Both line has the same code nearby.
Code:
    if ( ($add_session_id == true) && ($session_started == true) && (SESSION_FORCE_COOKIE_USE == 'False') ) {
      if (defined('SID') && zen_not_null(SID)) {
        $sid = SID;
I have ultimate seo url module installed. But I still get the same error when I disable seo module.
I would now install ultimate seo on the new demo site and then test again if it works on PHP 5.4

If it does, then compare your live site to your demo site - you may be able to find the piece of code which causes you trouble with PHP 5.4