However, 5 pages in I cannot add any additional text. Page Break command does not go to new page...it just seems fixed at 5 pages. I did change the first page from 2-column to single column because two columns were not needed. But now I cannot add any additional material into this one "chapter". What the heck is wrong?
Did you add a disconnected page in there somewhere? Is the entire chapter using a single flow tag?
For future reference, you could leave the entire chapter set to two columns, and then change the paragraphs on the first page to straddle both columns with Paragraph Designer > Pagination > Across all Columns.