It gets weirder... everything goes along just fine, until I try to import another text document (.docx) that contains hyperlinks. Then the "interruptions" begin again... and continue even after I've deleted the text box. I have to quit InDesign and re-start. I can open the text document in Text Edit and re-save it, and then the text imports into my InDesign document without issue.
Anyone have any ideas what's happening?