I understand that you are having some issues with the SlingPlayer for iPad since the Channel Guide does not work any longer as it used to.
According to the provided information, it seems that you are using the Slingbox Program Guide instead of the SlingPlayer for iPad guide. With this in mind, I recommend you to close the application and launch it again. Just make sure to use the iPad guide, which is located at the bottom of the main screen on the iPad menu. If you do not know how to locate it or pull it up, make sure to check this link: