*** SOLVED ***
The culprit was a feature of the “Holy Scripturizer” plugin that creates a “Show/Hide” link within the post, after the reference, which can display the passage within the text of the post. After disabling only that feature, the page loads as expected.
Thank you very much for your help, Scribblerguy! The ease of administering WordPress made recovery a breeze, and I appreciate the simplicity of the software.