If the Render settings are set to Video > WAV, the Preview Render option (F10) is not functional.

Steps to reproduce:

1. Launch iClone.
2. At the Render tab, select Video and then select WAV from the dropdown.
3. Press F10. No preview render is generated.
4. Change the render settings to something other than Video/WAV.
5. Press F10 again. Now a preview render is generated.

Desired behavior. F10 should always generate a preview render, regardless of the render settings.