I am having a couple of issues and am completely oblivious on how to fix them. I am running a Responsive Theme, but that does not seem to be the issue. I went to Appearance -> Customize, and all that shows up is the menu on the left side of the screen, none of the images on the right or any options to customize. When I click on Site Title or Tagline, Header Image, Colors or any options, nothing happens. That is my first issue.
The second issue I am having has to do with editing pages. I click on the page to edit, it takes me to that edit page, and I can edit using the visual editor. However, when I click on the Text (HTML) editor, again nothing happens. The same issue occurs when I click the Add Media button.
What can I do to fix these problems?