This actually broke several things for me! For one, the 'Messages' button on my theme no longer works (didn't with the original OS, but worked fine with the last update!). Also, the text in the call log doesn't size correctly. Again, it's a Theme-related issues, I suppose, but bot these worked before!
Why did I upgrade? I'm asking the same question - as I downgrade the thing again....
What fixes are there, really? (I didn't test wifi - which hasn't worked right for me yet...)