Microsoft Word 16.59 Not Working With Voiceover

I just updated my Word program from 16.52 to 16.59, and it's broken. I can access menues and sidebars and everything, but I can't arrow through the text.
I can scroll through with the VO keys left and right, but not line by line. If I try to arrow down, with quick nav off, it'll read the whole document but not the individual lines.
I write for a living, so this is really, really inconvenient. Anyone have any tips for how I should fix this? Is this a me-error or an update error? Anyone else experience it?
I deleted word and redownloaded it, but didn't help.
In the absence of that, any recs for writing apps that allow good spellchecking, work with Docx, and let me input headings?
Thanks!