I just upgraded from CS4 to CC. I have two problems with text in some text boxes:
I have checked margins of the text box and the paragraph options of the text paragraphs (margins, indents, alignments). They all look OK.
If I modify the text box, checking the box "Ignore text wrap", then the problem goes away; but then the text also will not flow around a real object that I want it to flow around.
There were objects in a hidden layer on that one spread. It seems that in CS4 when you "select all" you would also select objects in hidden layers; but in CC it doesn't.