I'm going to reply but not be much help here!

I had a disaster meal where I used yoghurt in the slow cooker. BUT:

1. it may not have been the yoghurt
2. I had awful morning sickness (usually in the evenings for me) and the smell of the dish made me chuck it all out - apparently that was an over reaction, so perhaps it wasn't that bad anyway - but looked pretty gross too I thought.

So, not very helpful... hope someone who has done it more than once without the effects of morning sickness pops in to help you more.