Empty Blank Invoice page or just [wp invoice] instead of invoice in WP-Invoice plugin

First of all check following things:

  • Try to use "Turn off compatibility mode." option in Settings/Main tab.

  • Disable third-party plugins one by one to be sure that the issue is not related to any of them.

  • Try to switch theme to WordPress default(TwentyTwelve) to be sure that the issue is not related to the current theme.

  • And contact your host provider. It can be that they do not allow get parameters to be paste.