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Until more information is discovered about which collection of plugins are causing the deletion problem, you can try a workaround solution: Just deactivate all of your plugins, make the necessary deletions, and then reactivate your plugins.
Permalink problems can be especially difficult to solve.
Most of the time, a large database backup file is caused by certain plugins storing a significant amount of data.
Plugins that block spam or that collect statistics on your blog can generate a large amount of data that really isn’t necessary to store in your database backup file.
If you’re using a common backup tool, you should be able to select the specific tables included in the database backup file.
Just include the tables that are important to your blog’s data in your backup file; leave out tables that generate interesting data, but that don’t contain the core information for your blog.
(You might even see an error message during Word Press installation related to the .htaccess file.) Such problems can occur because some hosts do not allow Word Press or you to access or edit the .htaccess file, which can cause permalink errors.
Most of the time, you can check your Control Panel to see whether your host allows .htaccess file editing.
Word Press has a few good automated tools for limiting the amount of spam that appears in comments.
Depending on your browser’s setup, though, these key shortcuts might not work.
You also can try visiting a proxy site, such as guardster.com, and load your page from there.
Sometimes, this problem carries an easy fix: Just force your Web browser to reload the page from the server.
The Web browser stores copies of Web pages in cache, or a memory area, on your computer.