Another new build for the Fast ring and Skip Ahead, build 17704 has been released! Along with a Bug Bash and a Contest. There are way too many updates to this build to include it here, so check out the blog for more info. So, here’s the Known Issues which is always nice to know.

Known issues

We’re working on adding dark theme in File Explorer and the Common File Dialog, but we still have some things to do. You may see some unexpectedly light colors in these surfaces when in dark mode and/or dark on dark text.
When you upgrade to this build you’ll find that the taskbar flyouts (network, volume, etc) no longer have an acrylic background.
We’re working on improving settings for HDR videos, games and apps in a new Windows HD Color page under System > Display. Some things temporarily will not work; notably, some users will not be able to enable/disable HDR display support.
Applications that use ICC color profiles may encounter errors such as Access Denied. This includes the Color Management control panel, and color profile switching on certain Surface devices.
When you use the Ease of Access > Make Text bigger setting, you may see text clipping issues, or find that text is not increasing in size everywhere. Also if your System > Display > Scaling and layout is not set to 100%, some text might appear unexpectedly tiny after reverting the “Make text bigger” value back to 0%.
Windows Mixed Reality may get stuck after going to sleep and display a persistent error message in Mixed Reality Portal or a “Wake up” button that doesn’t work. To work around this, restart your computer or explorer.exe to use Windows Mixed Reality again.