Earlier I explained how the last threaded text frame had "shrunk" and the answer was to turn off auto-size in text frame options.
After going back to A in the index to adjust text and arriving at the last frame this is what I'm left with. Trying to adjust the blocks of text, leaves me large gaps and moves some lines off the page. I can't even select text outside the frame.
I'm perplexed. I can't understand why it's not flowing as it did previously.
First thing to do is turn on visibility for non-printing characters so tyou can see any breaks that might have been added. Also check Keep options on paragraphs either side of a strange break.