Some of the problems fixed in the latest release include the removal of issues that caused the Start experience to become corrupted after upgrading as well as restoring a backup from a smartphone that had a different screen resolution.
Today we are releasing Windows 10 Mobile Insider Preview Build 10586 to Windows Insiders in the Fast ring. This build for mobile has a lots of good bug fixes and general improvements for you to check out. Overall this is a really great build, and we’re excited to get it out there for all of you to try. There is an important note for anyone who installed Build 10581 and then subsequently factory reset your phone.
Other issues fixed by the new release include:
Ability to set your save location from Settings > System > Storage and it will correctly reflect the current storage settings.
You can now move apps to an SD card without it causing the apps to crash.
We’ve made improvements to the Messaging + Skype app – through both app updates via the Store and also on the server side.
This should be seeing less resuming/loading text when switching apps.
The physical camera button should be working again if it wasn’t working for you before.