[SOLVED] Cannot register new members...

I have researched this until I am blue in the face! So far, no luck.

I have a test site that is running Joomla 3.4 using CB 2.0.7 with JCE Editor, Joomlashine template Decor and JSN Imageshow. I get the following message that appears at the top of the content area of the registration page when I turn on debug.

Warning: Cannot modify header information - headers already sent by (output started at ...plugins/system/jsnframework/jsnframework.php:1) in .../libraries/CBLib/CB/Legacy/CBCookie.php on line 37

Warning: Cannot modify header information - headers already sent by (output started at ...plugins/system/jsnframework/jsnframework.php:1) in ...libraries/CBLib/CB/Legacy/CBCookie.php on line 117

Also, when completing the registration form and clicking Sign On I get the following error in a popup. (The same thing is happening on my live site running Joomla 2.5.28 and CB 1.9.1.)

Session expired or cookies are not enabled in your browser. Please press "Reload Page" in your browser, and enable cookies in your browser. Please refresh/reload page before filling-in.

I have disabled each plugin/extension at a time, changed to a different template, and have had no different results. I am getting desperate! I MUST be able to have new users register!!!

Any ideas? I have tried every fix that I could find here without any improvements.

Your 3rd party JSN Framework system plugin within Extensions > Plugin Manger is modifying and sending the headers. This is normally just handled by Joomla. Try disabling the system plugin and see if issue persists. If it doesn't then please contact the developer of the plugin for them to take a look at what's going on with their extension. This also could be a caching issue, but with CB 2.0.7 we purge page cache for CB so shouldn't be an issue, but try disabling and purging all cache if enabled.

Thank you! I have disabled the JSN Framework plugin (although I was sure I had done so previously without any change) and it appears to be allowing registrations again. I will make sure that JSN knows about this so they can fix the problem.

The latest release of the JSN Framework System Plugin appears to have fixed the issue. Thank you for you help!