I have been feeding birds at my backyard feeders for about five years now. Suddenly, this fall, the birds are not eating out of my main feeder. I emptied the feeder and threw out the seed I had thinking perhaps there was something unappealing in the seed. Then, I replaced the feeder with a new one and I did change my bird seed selection at that point to one that is cheaper for me, but it's the standard Pennington bird feed. They aren't touching it either. I have another feeder with safflower seed, and they eat it, although not too much. I have cats in the neighborhood, and I've heard that when a predator is around (cats, hawks, etc.) birds won't feed. I don't know if that is the problem or not. I live in the warm south, fall is usually a busy time in my backyard, but the seed in my feeder hasn't been touched in at least a week. Any suggestions?