To resolve these and other problems, Microsoft has released a new update described as KB3061161. According to the company the new update rollup package provides a collection of fixes and improvements for Windows 10 build 10074:

The Start menu and Cortana do not open on Windows 10 Insider Preview after upgrading from Windows 10 Technical Preview Windows Error Reporting data remain in queue and are not uploaded Updated versions of preinstalled apps might not install with error 0x8004264A after upgrading to Windows 10 Insider Preview Qualcomm Atheros Bluetooth radio controllers might not function and indicate a Code 43 error in Device Manager Automatic updates might not initiate on mobile devices if an app on the device is not in the Store catalog Apps that are deployed to an SD card on mobile devices might not install or open This update fixes a hang that can occur when updating battery status

This update rollup also includes the following improvement: 

This update enables the Dolby Digital Plus codec

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