If you select a New Wave Activity with the activity type set to "Outbound Call", the outbound call screens do not display.
This was caused by the Outbound Translation being changed.
Navigate to Administration -> Customisation -> Translations.
Search for the following:
Caption Family: WaIt_type
Caption Code: Outbound.
Select this and change the caption code to “OutBound” instead of “Outbound”.
The issue here is that it needs a capital B has it had being changed to a small b.