Each arrow must be set correctly for Waze to route correctly. Initial turn restrictions on roads that are impported by Waze, are set automatically by the Waze routing engine. Automatically set turns can be altered by the routing engine, but manually set turns cannot. Unfortunately, both automatic and manually set restricted turns are represented by red arrows and cannot be distinguished. Currently, when you use the option to enable all turns, it will not fully change the routing from automatic to manual instructions, leaving possible so called RevCons. To clear these, select the junction with the mouse. Then, in the left menu pane, click the link to "Disallow all connections" and then "Allow all connections". Alternately you can use the keyboard shortcuts, by pressing the letter 'q' to disallow all connections, followed by 'w' to allow all connections.