I had the same problem what i did was duplicated the widget then reinstall it with a different name
I use this
<?php
// retrieve one post with an ID of 5
query_posts('p=1');
global $more;
$more = 0;
// the Loop
while (have_posts()) : the_post();
// the content of the post
the_content('Read the full post »');
endwhile;
?>
but still the more link is not working any ideas ?
It happened to me too while updating from 2.5.1 to 2.6.1
then i redownload/upload wordpress and all went ok
Wael Wafik
Web Designer
http://www.webdesign4me.com