The same thing happened to me once. I waited for what seemed like an eternity but could never get more that a slimy milk - no break at all. I never conclusively figured it out; but I strongly suspect that I forgot one of the two ingredients. What kind of rennet are you using? If it’s tablets, I’d recommend you switch immediately to a liquid animal rennet. And be sure to store it in a cool place, like a refrigerator. I keep mine in my cave and it works well.
They say that when you fall off a horse you should get right back on. Time to make another cheese!
