Maestro works with many browsers, but many users report Google Chrome and Microsoft Edge work well. There are several easy things you can do to reduce any issues with Maestro.
Try to refresh the page.
Check that your internet connection is working. Wired connections are often the most stable, especially if you are working from a home network. Choose the network icon from the system tray of your computer to confirm you are connected and secured.
If you are using a preferred browser, then try another to rule out browser-specific issues.
Make sure you are running the latest version of the browser. The current versions update themselves. If there is any question, you can download a new copy from one of these links.