Flash Session data with Cookie driver

I am having issues with Session flash data.

I am using Laravel 5.2.36, the web middleware is working fine.

I am trying to flash user notifications into the Session (e.g. within update() and store() methods of my Controllers, i simply call Session::flash() and redirect back to the edit page). As soon as i use „file“ instead of „cookie“ for persisting the Session data, everythin works as expected. However, i’d like to use „cookie“ for storing the data.

Some people suggested it might be related to the „debugbar“ plugin that intercepts requests and thus removed the session’s flash data. However, i am not using the plugin any more.

Do you guys have any idea what might cause this issue?

Best regards

Steffen