images missing after applying any theme

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I installed 5.5.2 yesterday and wanted to change theme. I successfully activated "Dark Chocolate" but all the theme images did not show up. The same is happening for other themes, for the default one as well.

After reading some posts here, I chmod /files directory to 777, but it did not help to solve the issue.

Is there something else I can do?

 
mortaelth replied on at Permalink Reply
I have to adjust the information I provided. What actually happened is that some blocks are missing after the theme changed.
mortaelth replied on at Permalink Reply
And now when I added Auto Nav, the images on background and header are back on. Can someone explain what happened please? I probably removed Auto Nav by accident, but why other stuff gone missing?

Thank you for your answers.