Vector iterations not calling function

Here is the vector iteration loop:

for(size_t i = 0; i < gameObjects.size(); ++i)
{
	gameObjects.at(i).Draw(window);
}

gameObjects contains a Ground and a Player (both are derived from GameObject) but neither one of their Draw() functions are called.

I have this same loop later with .Update() instead of .Draw(), and that one doesnt work either.

Using the debugger is see that the line

gameObjects.at(i).Draw(window);

is run, but the program never enters the function .Draw().