I remember when Skyrim came out I had intolerable pauses in gameplay. Fortunately, somebody posted a workaround (you had to start the game then do something to set the priority of the active process or some crap ... I forget) that kept me playing until the issue was fixed in an early patch.
The point is, I'm not surprised that any version of the game that people might be playing today before the game is officially launched might have some issue. Clearly, though, any such early installations don't include any patches that are scheduled to be released tomorrow.
We will have to wait and see what happens when things are actually supposed to happen.