That are the temp files that the script creates when is doing his job. Sometimes this files don't get deleted because miscelaneus reasons like a unexpected interruption so the file is still there.
I think that I could add a temp_* automatic delete. How many temp files you got?
I have told you... Fix the session path in your server and I told you that I change it to chevereto's root only for testing! And I told you that such thing is not recommended. I can't come to your server and fix your session path permission issue because that needs a root account.