I did some research and solved this issue. There was a discussion on a MacPorts defect:
Read the post for details. Michael Dickens pushed an update that corrected this issue. I was able to correct the issue by following the detective work by Fred Wright. Rebuilding gdk-pixbuf2 form source is the only solution. I carried this out by executing the following:
$ sudo port upgrade -s --force gdk-pixbuf2
Following this I was able to run gnuradio.
Stay healthy friends!
Bill