Shadowbox was making all Cufon replaced text vanish when launched.
I discovered a fix from the shadowbox-js forums:
http://shadowbox-js.com/forum.html#nabble-td4849859
I am Rob in this forum thread, my post dated Nov 9, 2010.
To summarize, in shadowbox-js/inc/frontend.php, I added the following on a new line after the skipSetup element:
$init_ops .= ' troubleElements: [""],' . "\n";
This completely resolved my issue. Just thought others may like to know, as i didnt see this posted elsewhere.