403 Forbidden Access Fix

See the link
http://wordpress.org/support/topic/plugin-wp-invoice-web-invoice-and-billing-403-errors-when-editing-invoices-using-wp-invoice-with-bullet-proof-security?replies=1

Direct link – http://www.ait-pro.com/aitpro-blog/2252/bulletproof-security-plugin-support/checking-plugin-compatibility-with-bps-plugin-testing-to-do-list/#wpinvoice

While I don’t have BPS installed (I use a different system) the instructions for editing the two .htaccess files worked and fixed the 403 error I was getting.

Thanks to DivaVocals for finding & sharing

http://wordpress.org/extend/plugins/wp-invoice/