The Switch crash described here due to the latest Flip4Mac update is not limited to Snow Leopard. I just experienced the same crash, and benefited from the same Flip4Mac downgrade advice, and I'm running Mac OS 10.5.8. Switch no longer crashed when I downloaded Flip4Mac 2.2.3.7 and simply installed it on top of the existing version.
Thank you for the advice.
This thread may better serve other users if it is renamed with a more appropriate title.