<p><font color=red>WARNING:</font> A second App Inventor session has been opened for this account. You may choose to continue with both sessions, but working with App Inventor from more than one session simultaneously can cause blocks to be lost in ways that cannot be recovered from the App Inventor server.</p><p>We recommend that people not open multiple sessions on the same account. But if you do need to work in this way, then you should regularly export your project to your local computer, so you will have a backup copy independent of the App Inventor server. Use "Export" from the Projects menu to export the project.</p>