I just had this freezing problem at the start screen...and I just fixed it by deleting the patches/online updates. This should work for everyone who has the problem I had, and I will explain how to do this very, very simple fix on the "new" X-Box 360 dashboard. I would give a step by step for the PS3, but I have no idea how to access these files there, so if someone else could explain that here, that'd be awesome. And another thing I noticed that I should share, is that my problem only caused MK9 to freeze at the start screen while being connected online. When offline, it worked fine.
Now, I'm not sure if you have to delete your MK9 saved game files. I don't know because I deleted that first before clearing and redownloading the updates. So I would try to do this fix I am talking about, then if the problem persists then just go ahead and delete the saved game files too(which sucks, but it's worth being able to get back online and play).
So...step by step:
1. Start your X-Box 360, when everything is booted and you are signed in, hit the X-Box home(guide) button on your X-Box 360 controller.
2. Slide on over to the right to Settings
3. Find System Settings and hit A on your controller to access the menu
4. Once in System Settings, go to Storage
5. Now that you are in storage, be sure that Hard Drive is highlighted in the light green(do click HARD DRIVE) and press Y for Device Options.
6. Once in device options, go down and select Clear System Cache. When you select that, a screen will pop up and say "This will perform maintenance on your X-Box 360 storage device. Do you want to continue?". When that comes up, select Yes.
7. Once you've done this, all the patches and updates you have once downloaded will be deleted, which is not a big deal at all. You will just be prompted to download the patches again when you start your games just like the first time. These updates load quickly.
Now that you've done all of this, it's time to make more people rage quit and send you hate mail. Enjoy.
