Square character appearing in lists of links

I just upgraded to FCKEditor 2.6.3. I'm using it with MediaWiki 1.11.1. I'm having a problem when adding a link to text in the FCKEditor interface. When I type in a search term to bring up an existing page, the first item in the list of pages in the Automatic Search Results is preceeded by a square character. The square character appears only next to the first item in the results list whether there's one result or 100. If I select the item preceeded by the square, the link doesn't work. If I look at the Wikitext, the link is displayed correctly. However, if I look at the HTML, it will look like this:

<a href="/wiki/index.php?title=%EF%BB%BFSenior_Staff_Meeting_Agenda&amp;action=edit" class="new" title="Senior Staff Meeting Agenda">Senior Staff Test</a>

Because these characters:

%EF%BB%BF

preceed the link, clicking on the link doesn't take you to the correct page.

If I select any other link in the list (when there are multiple links), it links the page correctly. This only affects the first link in the list.

Any ideas?