Save often! There is a common issue with Umbraco that your session may time out and you will need to re-login before you can save. Instead of entering the login screen right away and potentially losing all your changes, we recommend an alternative solution. If you open up a new tab and log into Umbraco from that tab, it will refresh your session and you will be able to go back to the original tab (the one with your changes) and the save feature will now work.