If you are seeing a Bad Gateway error, this is due to an intermittent internet connection between the computer and the server.
Basically, it means that when an action is performed, the computer and server are in constant communication (pinging each other), if an action takes too long, the ping is not reciprocated and therefore it creates a timeout error.
You can find more information about it here, however often there isn't much that can be done as it is a connection issue along the line. If the error occurs again, you are welcome to send us the files and we can upload them for you. Just ensure you tell us exactly where to upload them to, and what to name the files.
