Bit of an odd issue with Word this one, which I just can't fix and have never seen before.

I've got Word as part of Office 365, and I have a (now fairly large) document that I add to each day, by using bullet points, just the standard one when you click the bullet point icon on the toolbar.

It has always worked until this week - now when I press it, nothing happens - literally nothing. The only way I can get bullets to work is if I copy a whole line from one of the other bulleted sections above and then paste it in, but this isn't ideal. This has never been an issue until now and I've changed nothing in the document or Word settings.

Also slightly off topic but I'm not very up to speed with what you can do in word, but in the document I'm talking about there are headers (the day/date) and then the bullet points come underneath, but I do this manually. I gather there is a way to make this happen automatically with a template or something, or not?

Thanks for any advice