Are you using Messenger for Windows 10 or visiting the website directly?
If you visit the Messenger website, try clearing your browser's cache and cookies and try disabling the add-ons, as they may interfere with Messenger. Also check that your browser is up to date.
If you're using the Messenger application for Windows 10, check from Microsoft Store if it is up to date. If it is up to date, try uninstalling and reinstalling the app.