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I have only ever used brand new bags and always throw them away or use them for something else.
It has been suggested that the problem could lie with the storage of the vermiculite or even fungal infections in the air. It would seem that some vermiculite is sold in bags which have holes in them which permit airborne infection, whilst others are in resealable bags which ensures the least possibility of infection. This can be minimized by moistening the freshly opened vermiculite and then putting in the resealable bag/box that you intend to put the chips in, only opening it once the chips are out of the fungicide to put them in. Once you have done this if any vermiculite remains use it for something else and buy a new bag - after all it is a lot cheaper than a snowdrop! Again opening the bags as the pips develop allows for the introduction of any airborne disease so this should be avoided if at all possible. I have only ever used brand new bags and always throw them away or use them for something else.