Backspace key not working when Normal Style set to paragraph indent

You're right, of course. Cumulative updates shouldn't affect Office apps. I really can't explain it. All I know is that the WORD backspace issue I described always worked, and was working perfectly fine at 9 AM the morning this happened. I then clicked YES to install the latest cumulative update, and after it completed, the backspace feature stopped working. I discovered that the set left and first indent option under "Proofing - Auto Correct - Autoformat as you type" was unflagged. I flagged it, and presto, the backspace issue was fine again. How did it get unflagged? I have no idea. Was it flagged before the problem happened? I don't know. I'm just a user. I have no reason to look at or play with these application options unless something suddenly stops working the way it used to. Unless I did it in my sleep, I know I didn't unflag the Auto Correct option in question. If you or someone else with the techie skills wants to spend time researching this, have at it. Like I said, I'm just a user. I do freelance writing, so I use WORD heavily and rely on it to behave the way I originally set it up to meet my specific needs. It shouldn't suddenly and inexplicably reset itself to some factory default.