Still get the same error message with HTTPS Everywhere 5.0.3.
Trac: Summary: HTTPS Everywhere 4.0.3 breaks rottentomatoes.com: HD videos don't play to HTTPS Everywhere 5.0.3 breaks rottentomatoes.com: HD videos don't play
Is the rotten tomatoes rule enabled or disabled in your install? It should now be disabled by default, but if you've toggled it off or on in the past, the extension will override the default value.