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Symptoms

After you install the Windows 10 Technical Preview build 9879, a black or blank lock screen prevents you from logging on to Windows. When this problem occurs, the computer does not respond to keyboard or swipe actions.

Cause

This problem occurs because of a change in the behavior of WinLogon and LogonUI. This change introduces the potential for the deadlock.

Resolution

An update is available to resolve this problem.

How to obtain and install this update

Windows Update

Use Windows Update to automatically download and install the update.

Prerequisites

To apply this update, you must have Windows 10 Technical Preview build 9879 installed.

Registry information

To apply this update, you do not have to make any changes to the registry.

Restart requirements

You must restart your computer after you install this update.

This update contains the files that are listed in the following table.

File name

File version

File size

Date

Time

Hashes

Authui-ppdlic.xrm-ms

Not applicable

2,894

08-Nov-2014

11:30

Not applicable

Authui.dll

6.4.9879.2

2,473,472

08-Nov-2014

10:08

MD5: 6FB773CE32A5B1F8F0CB5E8C07A13946
SHA1: 876AA0C92FE7503240A36E8401307BE3AEB9D1D9

Actxprxy.dll

6.4.9879.2

4,164,608

08-Nov-2014

10:08

MD5: 44F9C4F4E0D31B9F3EE0AAD73ADB6630
SHA1: A9F4AB399CCD5B186F74DDADEB385F79E94ADE31

Logonui.exe

6.4.9879.2

13,824

08-Nov-2014

10:09

MD5: 8DD38771E7A783C35AF3E30A7022A40C
SHA1: 357A4543175D28AEEFB3D35BA0C77BBF9866ED6B

Authext.dll

6.4.9879.2

71,680

08-Nov-2014

10:08

MD5: 2EF729E2D4BC9A0DAF292DC6AA9BCEFC
SHA1: C63E32B0DC57DC97634BDD75B48E0B12A281F94A

Logoncontroller.dll

6.4.9879.2

401,920

08-Nov-2014

10:09

MD5: 71DACF2BA1F0B66D9B2F7B3B1B347B80
SHA1: 282D0D0D9E95327A6944678D1B7D4FEE902581F0

Pdc-mw.ptxml

Not applicable

4,531

08-Nov-2014

04:33

Not applicable

Pdc.sys

6.4.9879.2

85,024

08-Nov-2014

11:29

MD5: 7D0BD069F6804B38771638D63EA40181
SHA1: DF69BB70039A4ABF29D78031971A25F2C7B157FD

Shcore.dll

6.4.9879.2

688,192

08-Nov-2014

11:31

MD5: 316E350487F43B33C3F3CB6A2759DA41
SHA1: F7E19B03B7E58FBB2FD31D1B787165D62D9FBB58

@tileempty1x1image.png

Not applicable

120

05-May-2014

05:57

Not applicable

Twinui.dll

6.4.9879.2

14,028,800

08-Nov-2014

10:09

MD5: 17D2A53121F47D9040BB7C06CB2F08A5
SHA1: 0D7AC0290682B0909E4ECFCB350576FB93E81430

Windows.systemtoast.autoplay.lnk

Not applicable

1,454

08-Nov-2014

04:32

Not applicable

Windows.systemtoast.devices.lnk

Not applicable

1,446

08-Nov-2014

04:32

Not applicable

Windows.systemtoast.share.lnk

Not applicable

1,547

08-Nov-2014

04:32

Not applicable

Usercpl.dll

6.4.9879.2

1,306,624

08-Nov-2014

10:09

MD5: D091E39A70135371492DC074EA5B2DEB
SHA1: 6AB6E8D587488D9A7E3D120D3065DF61D9790C3E

Usercpl.ptxml

Not applicable

789

08-Nov-2014

04:34

Not applicable

Wininitext.dll

6.4.9879.2

32,288

08-Nov-2014

11:34

MD5: 6E6BA516A119AD49B0E8280D909B3CEB
SHA1: 9481A5DF68384EAC1FDE61672346490A790FA1F7

Wininit.exe

6.4.9879.2

225,408

08-Nov-2014

11:34

MD5: C76B88310712E3F3AB7F250F7750C782
SHA1: 45C5055EFE1A8C9E700515203D9598AC4A709BA2

Wmsgapi.dll

6.4.9879.2

16,896

08-Nov-2014

10:09

MD5: 16D9CF51544197E74E59740410C213C6
SHA1: B455B28D1D8B3579EFC96D6BEB4D228D86BFF00A

Winlogon.exe

6.4.9879.2

550,400

08-Nov-2014

10:09

MD5: 5811886282186EEEFAAE6D1B224C0115
SHA1: 7E5621EC78381E43936070823A465B26A1A838AF

@tileempty1x1image.png

Not applicable

120

30-Jul-2014

23:19

Not applicable

Twinui.dll

6.4.9879.2

12,641,280

08-Nov-2014

09:11

MD5: F791AD77ACFC4C99FA8D493AAE44EB7E
SHA1: E1D1B1641B0EAEC37BD84D462B308BF4D1E9BF2C

Wmsgapi.dll

6.4.9879.2

13,312

08-Nov-2014

09:11

MD5: DA2CD91B467D2FFD14FA6AFC4D893456
SHA1: 093FF2B0E348790A7C133562890FE7E464C1814D

Authui-ppdlic.xrm-ms

Not applicable

2,894

08-Nov-2014

09:29

Not applicable

Authui.dll

6.4.9879.2

2,223,616

08-Nov-2014

09:11

MD5: BA507C9A06281684EB539806A4FAA3A9
SHA1: F4E8B838ABAF38B2B9DD243C0B0E1B82E4BBE6FB

Actxprxy.dll

6.4.9879.2

1,583,104

08-Nov-2014

09:11

MD5: E3F551449DC84441F8DFB29FFE3B526F
SHA1: C74B7F273B680B02B2FE502ADEB27A29BE028356

Authext.dll

6.4.9879.2

59,392

08-Nov-2014

09:11

MD5: 3C62AE6BEE735BA161BA10CA6E40C9AB
SHA1: C465F273ECF81A04CB81E90EAB2416AB6BC19B8E

Logoncontroller.dll

6.4.9879.2

316,416

08-Nov-2014

09:11

MD5: 9A144E7904D1961D382D95098DF1D43E
SHA1: 61E57A54495EC628FC776B0ACF62625D83F241ED

Shcore.dll

6.4.9879.2

544,632

08-Nov-2014

09:34

MD5: 5AF92E28A1BEF5E6038712965E43BC9D
SHA1: A763080BB04F4A075765CE1134C1A47C418D7600

Usercpl.dll

6.4.9879.2

1,222,144

08-Nov-2014

09:11

MD5: 9260E275CE08B068BBFA2C3746D7F48D
SHA1: 531AB1F771785944DE8F60CCF2F16222291CA1EB

Usercpl.ptxml

Not applicable

789

08-Nov-2014

04:35

Not applicable

Wininitext.dll

6.4.9879.2

27,160

08-Nov-2014

09:37

MD5: DA92F510A5BBD5543ECC5A2C2E7A194B
SHA1: 4709E8E03D052CECD67A0A10DEA988D82820659D




Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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