Drupal 6.x

Background

Our webhost migrated our website to a new server on the weekend. We have Drupal Core: 6.26.

Symptoms

1. The Panels boxes on my pages are visible, but there is no content inside. Although the content is editable when I click the Panels tab. It just doesn't display.

2. The Panels module doesn't appear on the admin panels page. It is missing. Modules that depend on it state that is is missing.

Other facts and things I tried

3. The Panels module files are present in the modules folder on the web server.

The purpose of this topic is to cover the useful linux commands in creating VM for Drupal development. I am not linux expert so I can understand the pain of newbees into linux world.

Download Oracle VM box from https://www.virtualbox.org/wiki/Downloads

Follow the instructions in Oracle VM box I am not covering it here as instructions are simple to understand.

Hi
I'm looking for a module that would provide a two step login process. Not something like the Duo integration but essentially something like some of the online banking forms use i.e. you enter a password or some such on the initial page and then if this is correct you get asked for random letters and/or numbers from another password or security number on the next. E.g please enter letters 2 5 and 9 from your security phrase.

I really don't understand what it is.
I get many errors after some time to not working in website at all:

I'm getting a white screen of death page every time a save a page. The error below is causing it

Cannot modify header information - headers already sent by (output started at /home/user/public_html/sites/all/themes/community/template.php:1) in /home/user/public_html/includes/common.inc on line 345.

I currently have a couple of drupal sites set up and running.

I am looking to import a large number of items for sale from a supplier. I won't stock them and they would be on special order basis. The importation is not an issue as I will others do it.