Can’t preview drafts after upgrade to 4.0!

Do you have any kind of cache plugin used? Perhaps to help speed up the website. If Yes that just may be the issue here.

Another suggestion is change the current active theme to any default WP theme (twentyThirteen, TwentyFourteen), and then see if Preview give you an issue.

If it does not, then its possible that there is an issue with your current theme.

If the Preview issue persists, de-active all your plugins and check Preview with the default theme.

Preview should work fine now.

Next, one by one, activate each plugin and check preview until you discover which plugin is causing this problem.

Hope this helps.

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