修复bug：
In 9926 there were several issues which prevented Start from launching, these should all be fixed.
Search box now works if you have taskbar on the top/side of your screen.
After installing the last build (9926), you saw a boot selection menu when you rebooted your PC. We've fixed this and you should no longer see the boot selection menu – unless you're intentionally dual-booting.
We received feedback that people were seeing persistent grey thumbnails in the Collection view in the Photos app on Build 9926. We think we've worked through all these issues, so definitely let us know if you find a case where one still crops up.
存在bug：
Some people might hit an issue where the username and password boxes do not appear or don't accept input when logging in, which will prevent them from logging in. Possible workarounds include clicking the "Switch User" button, using Ctrl+Alt+Del, or pressing the power button on your PC to sleep/resume and try again.
It is possible to manually lock your PC during the initial out-of-box experience. If you do this, you will have to hard reboot your PC and restart the OOBE experience. (So don't lock your PC during OOBE :-)
There are several accessibility issues in this build, which may make it difficult to use with Narrator or 3rd party screen readers. Additionally there is an issue where using a Lens after enabling Magnifier may cause the screen to be unusable.
Some apps in the Store Beta will fail to install or update due to a licensing issue.
In this build, the Mail, Calendar, and People apps may be broken due to a licensing issue with the Store Beta. To get these apps working again, you need to follow these steps: Open powershell as administrator; Run the command Get-appxprovisionedpackage –online | where-object {$_.packagename –like "*windowscommunicationsapps*"} | remove-appxprovisionedpackage –online; Re-install Mail, People and Calendar from the Store (green tile)
You might notice a chess knight icon on your Lock screen to the right of the screen. This was added by the Lock screen team so they could tell via screenshots if someone was using the new Lock screen or the old one, and will eventually be removed in a future build.
Font sizes on the Lock screen on devices with high DPI can be really large.
We currently have the Tablet Mode notification turned off by default to address some of the issues we've been seeing. The notifications can be turned back on via Settings.
The touch keyboard doesn't show up on login screen which prevents you from unlocking your PC when Narrator is on.
Some people might see frequent prompts to restart to install updates, even though no updates need a restart. This prompt can be ignored safely.
