I applied the Windows 8.1 update a few weeks ago and had some issues with my machine. Windows was fine, but I lost my SQL Server service. A few other users, including some of the SQLServerCentral community also had issues and sent me ideas, but their fixes didn't work for me. That was OK because the problems gave me a chance to use PoSh to solve a real problem. I'll be blogging about that in the next week.
However the 8.1 update has caused lots of issues, and Microsoft is acknowledging these problems. That's good, but the process gives me pause, and to a large extent, I think this makes more and more people suspect about all of Microsoft's patching processes. I bet there are companies that feel even more justified in waiting for SP1 for SQL Server 2014 before upgrading, even though there is a chance that the patch itself will cause problems.
 
Read the rest of "Patching Problems" at SQLServerCentral.