Looking at the result you got with the test pages it seems that there is an issue with your session management. Since you have the handler set to files and the location seems valid I'm not sure what you would need to adjust to get the sessions working. You may want to check the directory that holds the session info to ensure that you have the proper permissions to access it.
You could also try creating a new directory yourself and setting the session save path to this new directory in your php.ini file. Depending on how this is setup from your hosting provider you may have to make this request to them to have them update the session settings for your account.