Is the Google Toolbar DU button kaput?

I can't get it to update any more--it still links me to the front page, but nothing more.

This is caused by the lack of a character set being defined by the RSS feed. The Google Toolbar defaults to the RFC Standard of US-ASCII. The content contains a single-quote character that can only be included in US-ASCII content as a '\x97'... But DU sends the literal character, causing a parsing error. The character set really needs to be set to the ISO-8859-1 character-set.

This is the error message that a feed validator returns: Your feed appears to be encoded as "ISO-8859-1", but your server is reporting "US-ASCII"

Since DU uses an Apache Web Server, there is a simple fix....

Apache. This can be done via the AddCharset (http://httpd.apache.org/docs/mod/mod_mime.html#addcharset) (Apache 1.3.10 and later) or AddType (http://httpd.apache.org/docs/mod/mod_mime.html#addtype) directives, for directories or individual resources (files). With AddDefaultCharset (http://httpd.apache.org/docs-2.0/mod/core.html#adddefaultcharset)(Apache 1.3.12 and later), it is possible to set the default 'charset' for a whole server. For more information, see the article on Setting 'charset' information in .htaccess (http://www.w3.org/International/questions/qa-htaccess-charset).

So, to answer your question... No, the button is not broken, it is following the rules strictly, as defined in the RFC and it is DU that is breaking the rules.

and see if I can get this fixed.