[Plugin: Custom Post Background] plugin dissapears from dasboard

Hi,
I was working on this plugin yesterday with no problems, all of a sudden last night the plugin dissapeared from the dashboard..
Its still active in my plugins, and present and correct in my plugin folder, but the settings/control panel for the plugin has dissapeared and I cannot access it whatsoever in my dashboard..

Any ideas?? This is proving to be a headache as I have made changes to my posts, which will take considerable time to resolve manually by code..

Thanks.

http://wordpress.org/extend/plugins/custom-post-background/