Microsoft has just release a new build, the Build 10586 to Windows Insiders and you can read the official changelog by clicking here. Here are some known issues with this build that Microsoft has also mentioned in its blog post.
Build 10586 known issues:
- After upgrading from one Windows 10 Insider Preview build to another Insider Preview build, Skype messages and contacts will disappear from the Messaging + Skype app. You can get Skype messages and contacts back by navigating to “C:\Users\<USERNAME>\AppData\Local\Packages\Microsoft.Messaging_
8wekyb3d8bbwe\LocalCache” in File Explorer and deleting or renaming the “PrivateTransportId” file. After deleting or renaming that file, go to the Skype video app and sign out of Skype and sign back in.
- The Insider Hub might be gone after upgrading to this build. You can get Insider Hub back by going to Settings > System > Apps & features and clicking “Mange optional features”, choosing “Add a feature” and selecting Insider Hub.