Calm down people.
All non steam users wont have the problem because they dont autoupdate. For any steam users, if you can, turn of steam autoupdate function BEFORE it updates to 1.500.
If you have already updated it, you could try a complete uninstall and then installing from the taleworlds website directly, but make sure to dl version 1.143 rather than anything else.
No idea how long it will take to fix, as Im not a computer wizard, you will have to wait on chadz or cmpx for an eta.
Hope this helps.