We're having trouble talking to the Sketchpad synchronization server. You may be connecting through an incompatible firewall or proxy server.
We were unable to connect to the Sketchpad synchronization server. This may be due to an incompatibility with your web browser or internet connection.
You seem to have opened this sketch in another browser window. If you'd like to use this window instead, you can reconnect.
Lost connection. This may be due to a loss of network connectivity.
Server not responding. This may be due to network connectivity issues or high load on the server.
Your browser's credentials or permissions have changed while viewing this Sketchpad. Try reconnecting.