Can't activate this plugin

I am unable to activate this plugin. It used to work fine, but for some reason now it is not. I am wondering if there is a way of adding an entry to active_plugins in the wp_options table of the database, i.e. manually activating the plugin? I can enable other plugins in the admin area, so not sure what the issue is with this plugin. I have tried deleting the plugin and reuploading, but still no joy.

Any help would be appreciated.

Thanks,

Nick

http://wordpress.org/extend/plugins/u-buddypress-forum-editor/