Empty Blank Invoice page or just [wp invoice] instead of invoice in WP Invoice plugin
First of all check following things:
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Try to use “Turn off compatibility mode.” option in Settings/Main tab.
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Disable third-party plugins one by one to be sure that the issue is not related to any of them.
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Try to switch theme to WordPress default(TwentyTwelve) to be sure that the issue is not related to the current theme.
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And contact your host provider. It can be that they do not allow get parameters to be paste.