The new year has barely begun, but more Windows 10 bugs have appeared. This time, Microsoft has disabled built-in administrator accounts, causing problems with FLAC audio, and breaking the new Sandbox feature along with Windows Defender Application Guard.
No administrator for you
Most have not enabled the built-in Administrator account at all and it is usually turned off in Windows 1
The one chosen to enable it presumably assumes It will still be after the upgrade. However, as explained on the Microsoft Taiwan blog, when you upgrade from the April 2018 update to the October 2018 update, the embedded administrator account will be silently disabled if you have both the built-in administrator account enabled and another administrator account present.
If you delete your local administrator account, you would not be able to get administrator privileges on your computer. Microsoft says it plans a patch sometime in January.
Where is my FLACing metadata?
According to MSPoweruser, FLAC support was already partially broken in the April 2018 update. But only the grading music and editing metadata were broken. You can still listen to your music.
Update to October 2018 puts an end to it. After taking the update, metadata for FLAC files will be controlled or trimmed. When you try to listen to a FLAC file in Groove Music or Windows Media Player, the track's first minute or so will be skipped.
The good news is that it seems to be fixed in an Insider Build. The bad news is the fix has not come to the October update, and this is not listed as a known problem. So it is difficult to say when it will be determined.
Sandbox and Application Guard Breakage
We really like the new Sandbox feature in the latest insider building. And Application Guard is a useful security feature if you want a locked down browser.
Unfortunately, as pointed out by both MSPoweruser and Windows Central, their dependence on container technology has lost both of them in the same update. Microsoft has acknowledged that the cumulative update KB4483214 completely breaks both functions. It says that the only solution is to uninstall the update. But you may not want to do this because KB4483214 corrects a zero-day Internet Explorer utilization.
It seems like a lot of trouble to patch Internet Explorer, especially since that update also caused startup errors for some Lenovo laptops. So, if you are not going to use Internet Explorer and you shouldn't use it anyway, you can safely uninstall this update and get those security features back.
Perhaps the only good news here is that these are much smaller bugs than before. But this shows that Microsoft needs to slow down and test more, instead of treating ordinary users as guinea pigs for updating testing.