General changes, improvements, and fixes for PC
•We fixed an issue resulting in PDFs opened in Microsoft Edge not displaying correctly (small, instead of using the entire space).
•We fixed an issue resulting in mouse wheel scrolling in many UWP apps and XAML surfaces being unexpectedly fast in recent builds.
•We’ve made some updates to the taskbar to reduce the number of times you may see the icons redraw. Most noticeably when interacting with the recycle bin, although in other scenarios as well.
•Antivirus apps must run as a protected process to register with Windows and appear in the Windows Security app. If an AV app does not register, Windows Defender Antivirus will remain enabled.
•We fixed an issue resulting in the System unexpectedly consuming a high amount of CPU for prolonged periods of time when enumerating Bluetooth devices.
•We fixed an issue resulting in Cortana.Signals.dll crashing in the background.
•We fixed an issue that caused Remote Desktop to show a black screen for some users. This same issue could also cause freezes over Remote Desktop when using .
•We fixed an issue resulting in mapped network drivers potentially displayed as Unavailable when using the net use command, and displaying a red X in File Explorer.
•Improved compatibility of Narrator with Chrome.
•Improved performance of Magnifier centered mouse mode.
•We fixed an issue where the Pinyin IME would always show English mode in the taskbar, even when typing in Chinese in the previous flight.
•We fixed an issue resulting in languages showing an unexpected “Unavailable input method” in their list of keyboards in Settings if you added the language via Language Settings in recent flights.
•Thanks everyone who’s shared feedback about the new Japanese Microsoft IME introduced with Build 18272. For the moment the IME version will be returning to the one that shipped with the October 2018 Update while we take your feedback into consideration.
•We’ve added support for LEDBAT in uploads to Delivery Optimization peers on the same LAN (behind the same NAT). Currently LEDBAT is only used by Delivery Optimization in uploads to Group or Internet peers. This feature should prevent congestion on the local network and allow peer-to-peer upload traffic to back off instantly when the network is utilized for higher priority traffic.
•我们修复了导致在Microsoft Edge中打开的PDF无法正确显示的问题（小而不是使用整个空间）。
•我们修复了一个问题，导致许多UWP应用程序中的鼠标滚轮滚动，并且XAML表面在最近的版本中意外地快速。
•我们对任务栏进行了一些更新，以减少您重新绘制图标的次数。最明显的是在与回收站交互时，尽管在其他情况下也是如此。
•防病毒应用程序必须作为受保护的进程运行才能向Windows注册并显示在Windows安全应用程序中。如果AV应用程序未注册，Windows Defender Antivirus将保持启用状态。
•我们修复了一个问题，导致系统在枚举蓝牙设备时长时间意外消耗大量CPU。
•我们修复了导致Cortana.Signals.dll在后台崩溃的问题。
•我们修复了导致远程桌面为某些用户显示黑屏的问题。使用时，同样的问题也可能导致远程桌面冻结。
•我们修复了一个问题，导致映射的网络驱动程序在使用net use命令时可能显示为Unavailable，并在文件资源管理器中显示红色X.
•改善了讲述人与Chrome的兼容性。
•改进了放大镜中心鼠标模式的性能。
•我们修正了一个问题，拼音IME将始终在任务栏中显示英语模式，即使在之前的航班中输入中文。
•我们修复了一个问题，如果您在最近的航班中通过“语言设置”添加了语言，则导致语言在“设置”中的键盘列表中显示意外的“不可用输入法”。
•感谢所有与Build 18272一起介绍的新日本Microsoft IME的反馈意见。目前，当我们考虑您的反馈时，IME版本将返回2018年10月更新版附带的版本。
•我们在上传到同一局域网（同一NAT后面）的Delivery Optimization对等体时添加了对LEDBAT的支持。目前，LEDBAT仅用于上传到群组或互联网对等的传递优化。此功能应防止本地网络拥塞，并允许当网络用于更高优先级的流量时，对等上载流量立即退出。
Known issues
•The hyperlink colors need to be refined in Dark Mode in Sticky Notes if the Insights are enabled.
•Settings page will crash after changing the account password or PIN, we recommend using the CTRL + ALT + DEL method to change the password
•Due to a merge conflict, the settings for enabling/disabling Dynamic Lock are missing from Sign-in Settings. We have a fix, which will flight soon.
•Settings crashes when clicking on the “View storage usage on other drives” option under System > Storage.
•The Windows Security app may show an unknown status for the Virus & threat protection area, or not refresh properly. This may occur after upgrade, restart, or settings changes.
•Delete previous version of Windows in Configure Storage Sense is not selectable.
•Settings will crash when opening Speech Settings.
•Insiders may see green screens with error System Service Exception in win32kbase.sys when interacting with certain games and apps. We have a fix that will flight in an upcoming flight, we appreciate your patience.
•There’s an update block for this build in place for a small number of PCs that use Nuvoton (NTC) TPM chips with a specific firmware version (1.3.0.1) due to a bug causing issues with Windows Hello face/biometric/pin login not working. The issue is understood and a fix will flight to Insiders soon.
•If you install any of the recent builds from the Fast ring and switch to the Slow ring – optional content such as enabling developer mode will fail. You will have to remain in the Fast ring to add/install/enable optional content. This is because optional content will only install on builds approved for specific rings.
•如果启用了Insights，则需要在Sticky Notes中以暗模式细化超链接颜色。
•更改帐户密码或PIN后设置页面将崩溃，我们建议使用CTRL + ALT + DEL方法更改密码
•由于合并冲突，登录设置中缺少启用/禁用动态锁定的设置。我们有一个修复，很快就会飞行。
•单击“系统”>“存储”下的“查看其他驱动器上的存储使用情况”选项时，设置崩溃。
•Windows安全应用可能会显示病毒和威胁防护区域的未知状态，或者无法正确刷新。升级，重新启动或设置更改后可能会发生这种情况。
•无法选择“配置存储感应”中删除以前版本的Windows。
•打开“语音设置”时，设置将崩溃。
•在与某些游戏和应用程序交互时，内部人员可能会在win32kbase.sys中看到绿屏错误系统服务异常。我们有一个将在即将到来的航班中飞行的修复，我们感谢您的耐心等待。
•对于使用具有特定固件版本（1.3.0.1）的Nuvoton（NTC）TPM芯片的少数PC，有一个更新块，因为导致Windows Hello /生物识别/引脚登录问题的错误工作。这个问题得到了解，很快就会有一个解决方案。
•如果从快速环安装任何最新版本并切换到慢速环 - 可选内容（如启用开发人员模式）将失败。您必须保留在快速响铃中才能添加/安装/启用可选内容。这是因为可选内容仅安装在针对特定铃声批准的构建上。
