Windows Phone 8.1 unusable

Windows 8.1 pro development host (in VirtualBox virtual machine) qt-opensource-windows-x86-winrt-5.4.0.exe Lumia 530, RM-1017_1008 Core Build ID 8130.28 (02048.00000.14431.35000) Repeated the problem with Qt5.4.1 snapshot qt-opensource-windows-x86-winrt-5.4.1_2015-01-08_15-08-50-5 On a physical Windows 8.1 Pro installation, not virtual machine. Microsoft Visual Studio Professional 2013 Version 12.0.31101.00 Update 4 Microsoft .NET Framework Version 4.5.51641 Installed Version: Professional LightSwitch for Visual Studio 2013 06177-004-0444002-02312 Microsoft LightSwitch for Visual Studio 2013 Team Explorer for Visual Studio 2013 06177-004-0444002-02312 Microsoft Team Explorer for Visual Studio 2013 Visual Basic 2013 06177-004-0444002-02312 Microsoft Visual Basic 2013 Visual C# 2013 06177-004-0444002-02312 Microsoft Visual C# 2013 Visual C++ 2013 06177-004-0444002-02312 Microsoft Visual C++ 2013 Visual F# 2013 06177-004-0444002-02312 Microsoft Visual F# 2013 Visual Studio 2013 Code Analysis Spell Checker 06177-004-0444002-02312 Microsoft® Visual Studio® 2013 Code Analysis Spell Checker Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved. The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved. Windows Phone SDK 8.0 - ENU 06177-004-0444002-02312 Windows Phone SDK 8.0 - ENU Application Insights Tools for Visual Studio Package 1.0 Application Insights Tools for Visual Studio ASP.NET and Web Tools 12.4.51016.0 Microsoft Web Developer Tools contains the following components: Support for creating and opening ASP.NET web projects Browser Link: A communication channel between Visual Studio and browsers Editor extensions for HTML, CSS, and JavaScript Page Inspector: Inspection tool for ASP.NET web projects Scaffolding: A framework for building and running code generators Server Explorer extensions for Microsoft Azure Websites Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure ASP.NET Web Frameworks and Tools 2012.2 4.1.21001.0 For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563 ASP.NET Web Frameworks and Tools 2013 5.2.21010.0 For additional information, visit http://www.asp.net/ Common Azure Tools 1.3 Provides common services for use by Azure Mobile Services and Microsoft Azure Tools. Microsoft Azure Mobile Services Tools 1.3 Microsoft Azure Mobile Services Tools NuGet Package Manager 2.8.50926.663 NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/ . Office Developer Tools for Visual Studio 2013 ENU 12.0.30626 Microsoft Office Developer Tools for Visual Studio 2013 ENU PowerShell Tools 1.3 Provides file classification services using PowerShell PreEmptive Analytics Visualizer 1.2 Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product. SQL Server Data Tools 12.0.41012.0 Microsoft SQL Server Data Tools Windows Phone 8.1 SDK Integration 1.0 This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio. Workflow Manager Tools 1.0 1.0 This package contains the necessary Visual Studio integration components for Workflow Manager.