Single quotes Showing /' in posts and quotes.
Is your host running PHP 5.3 and is magic quotes turned on?? You can check both of these by going to ACP > Tools & Maintenance > PHP Info. If they are on 5.3 and magic quotes is on, they need to disable it.
What about magic quotes?? Press Ctrl + F and type magic in, should go to where it says if it's on or off.