Problem - just gray screen, no web page image Rated 2 out of 5 stars

Used this extension a lot in the past, but it stopped working for me about 2 versions ago on Firefox. Currently on Firefox 22.0, Awesome screenshot 2.4.0. I just get a gray screen where the page image should be. I have uninstalled the extension, cleaned all references to it in about:config and user.js, then reinstalled and it still does not work. Gave it a 2 star rating until I get it fixed, then will be 5 stars. Any suggestions from anyone?

This review is for a previous version of the add-on (2.4.0.1-signed).