Changes in WordPress are not saved.

Changes in WordPress are not being saved. I modified the homepage, clicked "update", wait. When the page is refreshed, it says at the top "Page updated" but the information at the bottom is unchanged.

I ran  the WordPress database repair program, but no tables were corrupted.

I tried to install wp-optimize, as perhaps that would help optimize the tables and remove junk. I was able to install the file, but when I click on "activate" the plugin is NOT activated. It remains in the unactivated state.

What could be the problem and what could I do to fix this?
Lev SeltzerAsked:
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Lucas BishopClick TrackerCommented:
Do you have any kind of caching plugin installed?
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Lev SeltzerAuthor Commented:
I had, but it was turned off.
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Lucas BishopClick TrackerCommented:
In your wp-config.php file, have you defined a user that doesn't have write privilege in the WP DB?
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Lucas BishopClick TrackerCommented:
Also, are you editing an actual template file? It may be that the permissions aren't set to allow writing of the files through the dashboard.
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Lucas BishopClick TrackerCommented:
This gives details on the write permissions that need to be set on your files and folders:
https://codex.wordpress.org/Changing_File_Permissions
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Lev SeltzerAuthor Commented:
The website was working. Something has gone wrong. I can't even login directly (I have a back door via a multi-site control panel). I don't get an "invalid password" error; Instead, I just get another login screen. I have disabled ALL plugins with the same result. I uploaded another copy of WordPress via FTP and copied it over the existing files with the same result.
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Lev SeltzerAuthor Commented:
The server had been attacked, and after the attack the SQL server was in recovery mode. Hence all the tables were READ ONLY.
The technicians took it out of recovery mode.
Problem solved.

Thanks for your suggestions.
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