If you experience that mobile devices don’t show up in Ghostlab’s client list and actions aren’t synchronized (but your desktop browsers are there and get synchronized), the reason is most likely a network problem.
If all the connected browsers disappear from the client list and the page isn’t synchronized anymore, please have a look a this article.
Typically, some security software (a firewall or an antivirus software) or even the network router blocks the port that Ghostlab uses to communicate the synchronization.
If you know that (and which) ports are being blocked, you can configure Ghostlab to use open ports: In the Preferences, search for “port” and under “Websocket port” untick “Select automatically” and enter the port to use.
If you don’t know what any of this means, please contact your IT department and explain the problem to them.