This question was mine and I thank all those that responded. I was just not patient enough, the ears are coming out nicely. I got the garden in late, because of the unusually cooler and wet spring.
Corn is wind-pollinated and should be planted in blocks of at least 4 rows for good pollination to occur. Also, if you are in a climate that has experienced low temperatures or too much moisture, or certainly any frost, that will have damaged your chances or at least delayed them.
I think it just needs to grow more. Four feet high is not that tall for corn, although it depends on the variety. Many types of corn require a long growing season. I doubt that there is anything wrong with it. Let it be for a couple more weeks of hot weather.
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