[Plugin: Digg Digg] FATAL ERROR with floating display

This plugin is broken. I have tried all configurations of the Digg Digg plugin but all seem to have a different Fatal Error. Sometimes it makes my sidebar disappear, sometimes it makes all my posts disappear.

I see that this problem goes back to at least MARCH of this year. Why hasn’t it been fixed yet?

I am using the WP-Ellie theme.

Here are the errors (most recent one first):

Fatal error: constructFloatingButtons() [function.constructfloatingbuttons]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "DD_Digg" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/XXXX/public_html/wp-content/plugins/digg-digg/digg-digg.php on line 278

Fatal error: dd_page_for_floating_display() [function.dd-page-for-floating-display]: The script tried to execute a method or access a property of an incomplete object. Please ensure that the class definition "DD_Digg" of the object you are trying to operate on was loaded _before_ unserialize() gets called or provide a __autoload() function to load the class definition in /home/XXXXX/public_html/wp-content/plugins/digg-digg/include/template/dd-template-floating-display.php on line 65

Can anyone help me? Also, is it possible to add your own icons instead of the default? That is if the floating problem ever gets fixed.

http://wordpress.org/extend/plugins/digg-digg/