Yes, this kind of bit me. I was using a custom .msstyle, and the update reverted it back to the original. The only thing I had edited in the default was the aero.msstyle was the glow around the title text. Anyways, when I noticed the glow was missing, I tried re-editing the file without repatching. That ended up really breaking my system upon reboot--ended up having to refresh my Surface and reinstall all of my software, as I was just staring at a black screen when Windows rebooted. Anyone have any advice on what I can do differently to utilize a custom .msstyle to prevent this in the future? I would like to leave the default windows theme intact, but use a secondary theme that uses a modified aero.msstyle, just in case something breaks with a future Windows update. Any thoughts on how to create a new .theme file and pair it with the modified .msstyle?