[Plugin: WP-Invoice – Web Invoice and Billing] Total doesn’t come out on Invoice.

Have you solved this? Just noticed the problem with mine too.

Edit: Somewhat resolved for me. There is a plugin conflict with CollabPress plugin and WP-Invoice. I turned off Collabpress and all is well again. Try disabling any newer plugins you may have installed since the last time you noticed WP-Invoice working correctly.

Any problems with total calculations is caused by javascript errors, which are usually caused by other plugins using a different version of jQuery, or causing some sort of JS conflict.