Since updating to the latest version of Libre office, I can’t open document writer
That’s vague, you’re not gonna get any useful answer like this. What’s your system? How do you run LO Writer: do you run it from terminal, do you run it by clicking an icon in your environment, anything else? Do you get any errors when you do that, anything unusual you see? And while on it: might be worth trying to run lowriter command from terminal, just to see if there’s any errors or warnings.
I think a windows update caused the problem, so I deleted Libre Office and then re-installed it, and now it works fine