Second update: there has not been a single bird at my bird feeder. Not even a squirrel.
Does it take time for the birds to figure out there's seeds available? Maybe it's the location. I have mine under a large Bradford pear tree hanging from a branch about 5 feet off the ground. There are birds constantly bathing in a small creek 15 feet away from the feeder, so I'm stumped as to why there have been no takers. Can anyone help with my lack of bird activity?