Flashdata Not Passing Message in CodeIgniter 3

Hello.

We are in the process of updating our website from CodeIgniter 2 (.1.1) to CodeIgniter 3 (.1.9).

We use the set_flashdata() method to set a message to be displayed on redirect in numerous places in our code.  When the redirect occurs, the message disappears.  This was working fine in our original CodeIgniter 2 application.

It should be noted that this only occurs when there is a redirect (i.e., index.php file to run from the beginning).  If we reload the view without redirecting, the flashdata shows up correctly. 

I tried using keep_flashdata(), but it did not work.

I was wondering if perhaps this has to do with the way the new Session class works.

Any help would be greatly appreciated!