Rick - I know how distressing this can be especially when you have been so looking forward to seeing your rather expensive little treasures bloom.
For this reason I began growing my bulbs in lattice pots. It does not stop it happening but it enables you to keep a check on the bulbs when they are dormant. That said I am having lots of bulbs rotting in lattice pots this year with all the rain. I now make cloches with net over them from old hanging baskets and place over my favourites as soon as they have finished flowering. I secure the basket with a few metal pegs pushed into the ground. In one sunnier area this is seeming to work.
I now intend to grow all my snowdrops under deciduous trees in my unprepared woodland area where Narcissus Fly are less likely to be active. I am not saying they will not venture up there but am told they prefer to have a bit of sun on their backsides when egg laying
Once you have bigger clumps of more vigorous spreaders the odd bulb goes un-noticed but I understand the disappointment when it is your only bulb. Don't give up hope
Jennie