Cannot Remove Wordpress Menu items

I cannot edit or delete items in Appearance/Themes/Menus.
My main menu has items that need to be removed. I expand them and click remove.
The items disappear.
I click Save Menu and the items return.

I am running 4.9.6 all plugins up to date.
What's going on here?
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Julian HansenCommented:
Have you checked the error log for errors.

The standard procedure when WordPress stops doing what it should is to disable your plugins check to see if the problem is resolved and then re-enable them one at a time until the problem comes back.

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JP_TechGroupAuthor Commented:
So simple. I panicked and forgot everything I knew. It was a MySQL permission problem.
Thank you!
JP_TechGroupAuthor Commented:
Permissions issue in MySQL
Julian HansenCommented:
You are welcome.
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