yotmon wrote:Make some white ones and you've got a Mexican flag
Makes me wish that there was a 'Like' button!
Seriously though, you've had green, you've now got red: it's almost certainly some form of contamination.
Use your own fridge to bloom the sausage. If you didn't have the problem before you changed fridge, then the answer's that simple. You don't always have to know the reason to know the answer!
Maybe even change your salt?
I'm sure that analysing your ingredients, and method, will provide the answer.
Phil