My theme customizer preview screen is suddenly broken. A large part of the preview screen is not visible. It is"greyed out". enter image description here I have tried the following.

  • Tried disabling all plugins. Did not work.
  • Tried switching theme. Same issue.
  • Tried restoring an earlier backup, where the the theme customizer worked. Did not work.

Should, I try reinstalling wordpress? Could it be something with the core files?
I can see, that google ads is causing many errors in the debug tool. Could these errors cause the issue? enter image description here

  • Like you state, my first reflex would be to re-install WordPress to make sure that no file has been corrupted. You can do that safely in a local environment or staging site. – WSU Aug 28 '19 at 10:14

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