Try resetting your custom permalinks back to the default setting and deleting/renaming your WordPress .htaccess file. If this works, then review Using_Permalinks before setting a custom permalink structure back up again.
I reset the Permalinks to default, and it did correct the issue. Why would it allow it for the posts but not the pages? All the posts are fine.
Here is my htaccess file. What do I need to change to make the Permalinks work for pages?
# -FrontPage-
RewriteEngine On
RewriteBase /
#RewriteRule ^index\.php$ - [L]
# uploaded files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2 [L]
# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]p
# BEGIN WordPress
# END WordPress
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