The "Additional Meta Tags" from the SiteSettings page are not being added to HTML.

I added the following at line 114 to MetaContent.ascx.cs to fix the problem:

            metaAdditional = new Literal();
            if (currentPage.PageMetaAdditional.Length > 0)
            {
                metaAdditional.Text = currentPage.PageMetaAdditional;
            }
            else
            {
                metaAdditional.Text = siteSettings.MetaAdditional;
            }
            this.Controls.Add(metaAdditional);

Cheers,
Jesse

I think it is not nesessary to remove this setting - sometimes it still can be useful. But the default value should be an empty string, as you did it now.