For the first time in all these years, I'm having a peculiar problem with the idli/dosa batter fermenting very well but not rising at all :thumbsdown. In tamil, 'pulikkardhu .. but pongi varavillai' -- it has fermented with tiny bubbles on the surface, but the amount of batter has not increased even a centimeter. I've tried keeping it for longer - even 20hrs.- in indirect heat, still the batter colour becomes yellowish but doesn't rise in quantity at all ...don't know why ? :confused2: I haven't changed any proportion or the dal/rice quality or even the water amount and timing is the same . I've never had any such problem before -:idontgetit:- what could be the cause ?