Can’t access pages

Have you tried switching to the unedited default Theme (Twenty Seventeen, etc.) for a moment using the WP dashboard to rule out any theme-specific issue (theme functions can interfere like plugins).

Thanks for responding. Can one just switch between themes? Divi is a builder type theme, I am worried that “stuff” will happen. I am suspicious that Divi is the cause, maybe I can find a way to role back to the version I had yesterday morning??

For any question about DIV, please please contact the author directly on their site. Commercial products are not supported in these forums.

Divi by Elegent theme forum: https://www.elegantthemes.com/forum/

My question was not so much to do with Divi, but Themes in general: can one safely switch from one theme to another?

Could a theme affect the behavior of edit.php?

It seems odd that it works fine for, say, projects and posts, but not pages.

Ok. I tried using Firefox instead of Chrome and I can access my pages!

Does this suggest a caching or cookie problem in Chrome?

Can’t say for sure.

However it has nothing to do with WP.

You are correct, and thank you for your patience.

Flushed Chrome local cache and now I can access pages.

Is there some place where there is a list of things to try first? Like a trouble-shooting guide?

Seems like it should look something like this:

Try a different browser. If it works it is likely a caching issue. Flush local cache. Flush any caches specifically to do with WP (in my case SG Optimizer). Flush CDN cache (in my case CloudFlare).

If you get an access or permission related message, check file (644) and directory (755) permissions on the server. Do a recursive re-set.

Deactivate every plug-in. If this fixes the problem, switch them on one-by-one until the problem re-appears. The issue is likely two plug-ins not getting along or a plug-in and the theme not getting along. Figure it out by a process of elimination.

Check your theme is up-to-date. If not, update it. If this doesn’t help, and it is possible, try rolling back to an earlier version. If you can only roll-back one version, try rolling back first, then try updating.

Check you have the most up-to-date WordPress. If you do, re-install it anyway.

If the problem is that something you think should show up on a page but it doesn’t, use MySQL to check that the data is actually in the database.

If all else fails, revert to the last known good back-up. But be aware you may lose changes you have made in the interim period.

Anyway, once again, thanks for hearing me out!