private void createGUI(){
		  gui = new JFrame("GUI");													
		  gui.setBounds(100, 100, 136, 227);											
		  gui.setVisible(true);															
		  gui.setResizable(false);														
		  JPanel panel = new JPanel();
		  gui.add(panel);
			panel.setBorder(new EmptyBorder(5, 5, 5, 5));
			JLabel lblRockCrabs = new JLabel("ROCK CRABS");
			lblRockCrabs.setFont(new Font("Arial", Font.BOLD, 14));
			lblRockCrabs.setBounds(10, 11, 100, 14);
			panel.add(lblRockCrabs);
			
			JLabel lblFood = new JLabel("Food");
			lblFood.setBounds(45, 94, 30, 14);
			panel.add(lblFood);
			
			JComboBox<String> comboBox_1 = new JComboBox<String>();
			comboBox_1.setBounds(10, 112, 95, 20);
			comboBox_1.addItem("SELECT ONE");
			comboBox_1.addItem("Lobster");
			comboBox_1.addItem("Swordfish");
			comboBox_1.addItem("Shark");
			comboBox_1.addItem("Lobster");
			comboBox_1.addActionListener(e -> foodSelected = comboBox_1.getSelectedItem().toString());
			panel.add(comboBox_1);
			
			JLabel lblVersion = new JLabel("version 1.0");
			lblVersion.setBounds(20, 22, 54, 14);
			panel.add(lblVersion);
			
			JButton btnStartScript = new JButton("START");
			btnStartScript.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent e) {
					started = true;
					gui.setVisible(false);
				}
			});
			btnStartScript.setBounds(24, 154, 71, 23);
			panel.add(btnStartScript);
	    }
	

For some reason the GUI is not showing up fully. It pops up with nothing on it, and I have to hover my mouse over it to suddenly make everything show up. Then it acts normally and I can select my options and move on. 

What is happening? I followed two tutorials the best I could, but there is clearly something I missed, as other scripts have no problem.

Move setVisible(true) to the last line.

Add the jpanelto the jframe after you've added all the components to it.

Move setVisible(true) to the last line.

Thanks, this fixed it!