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This thread is resolved. Here is a description of the problem and solution.
Problem: Conflict with WPML String Translation, Learndash and PDF Embedder Premium Secure Solution: The PDF Embedder Premium Secure plugin contacted me and gave me the temporary fix while waiting for the next update: PDFEmbedder-premium-secure/js/pdfemb-blocks.js file. Locate the first line: var _ = wp.__nx; // The _() function for internationalization.
Change it to (note the double underscore after var): var __ = wp.__nx; // The _() function for internationalization.