Log into your phpmyadmin (or what ever you use), go to wp_options, browse, click the double >> (to get to end of table). The variable you are looking for is “wpb_active”. Change from Yes to No. Plugin is now disabled.
I am attempting to figure out what went wrong with this as well. I suspect it is something with PHPBB3 3.0.8. It appears to be a problem with a few plugins.
