On Sat, 8 Sep 2012 16:40:48 -0400, "Ray"
> wrote:

>I've been making sourdough for many years and this is the first time I've
>encountered this problem:
>
>None of my four starters will proof. They just lie there as if dead.
>
>These have not been neglected. I used two of them as recently as a week ago
>to make bread, and they responded exactly as always.
>
>Any guidance welcome.


Are the starters themselves showing activity when refreshed?

Boron