I got a local script and a server script in my PlayerGUI, in Client Server Mode test. The Server cant see inside the PlayerGUI, but the Client can. Why is this?
The client moved the stuff from StarterGui. You might think this is counterintuitive, and that the server should do it, but on a more serious note you shouldn't be manipulating the PlayerGui from a server.
If you need access to your GUIs from the server with FilteringEnabled on, any GUIs which have references in regular Scripts and are moved across from the server into PlayerGui should be manipulatable.