GUI button vanishes when I release mouse button

Hi all. I'm having some GUI button issues. I have a piece of code right now for when you select some objects a test question comes up, telling you to select a specific object. After you select that object I want a GUI button to pop up that says either correct or incorrect. For the most part I have it, only when I release the mouse button the GUI button disappears. I have tried different combos of GetMouseButton, GetMouseButtonDown, and GetMouseButtonUp. But when I use GetMouseButtonDown in place of GetMouseButton the GUI button doesn't even show up at all. My code follows:

if(allObjectsClicked) { if(isClicked == false) { GUI.Box (new Rect (350,10,350,120), "Please click the learning cube."); { if (Input.GetMouseButton(1)) { if (Physics.Raycast (ray, out hit)) { if(hit.collider.gameObject.name == "learningCube2" || hit.collider.gameObject.name == "learningCylinder2") { isClicked = true; } } } } }

     if(isClicked)
     {
         if (Input.GetMouseButton(1))
         {
             if (Physics.Raycast (ray, out hit))
             {
                 if(hit.collider.gameObject.name == "learningCube2")
                 {
                     if(GUI.Button(new Rect (350, 10, 350, 120), "That was correct. You may now continue."))
                     {
                         navButtonEnabled = true;
                         Debug.Log("Why isn't the GUI button staying, jerk?");
                     }
                 }

                 else
                 {
                     GUI.Box(new Rect (350, 10, 350, 120), "Sorry, the correct answer was the cube. Click to advance.");
                     Debug.Log("Why isn't the GUI box staying part II");
                     navButtonEnabled = true;
                 }
             }
         }
     }
 }