Wikimedia Bugzilla is closed!

When included in RSS query printer output, valid page titles containing ampersand "&" characters generate invalid XML. Some feed readers are OK with this; others (including firefox live bookmarks) refuse to play.

I resolved it with a small change in SMW_QP_RSSlink.php, in the text() function:

$text .= "\t\t<title>$this->label</title>\n";

changed to 

text .= "\t\t<title>" . $this->clean($this->label) . "</title>\n";