code signing doesn't work anymore

Hi Andy,

I have been signing my updates for several years and it all works fine. Suddenly I am getting the classic "Improperly signed" error when the clicking "install and relaunch."

I have gone over it ten times looking for some dumb typo but no luck.

I signed the zipped app using your ruby script, uploaded it and added the signature to the appcast, and no luck.
Here is the appcast:

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:sparkle="http://www.andymatuschak.org/xml-namespaces/sparkle" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <channel>
    <title>backuplist+ update</title>
    <link>http://rdutoit.home.comcast.net/~rdutoit/dir/blistbeta.xml</link>
    <description>Most recent changes with links to updates.</description>
    <language>en</language>
    <item>
     <title>Version 1.2</title>
     <sparkle:releaseNotesLink>
      http://rdutoit.home.comcast.net/~rdutoit/dir/rnotesBeta.html
     </sparkle:releaseNotesLink>
     <pubDate>Sat, 09 Oct 2010 19:18:54 -0400</pubDate>
     <enclosure url="http://rdutoit.home.comcast.net/~rdutoit/pub/backuplistBeta_1.2.zip" sparkle:version="1.2" length="2558630" type="application/octet-stream" sparkle:dsaSignature="MC0CFCjJ3Eio692q4stb8AokuyqVza/NAhUAg6o6ABs+89owlRXDxajqogeyNJU="/>
    </item>
  </channel>
</rss>

Any thoughts anyone?

Thanks Rob