*BUMP*
I'm having the exact same problem. wsyncmgr.log is clear - no issues there.
From Windowsupdate.log:
2015-03-31 09:26:20:287 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:287 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
2015-03-31 09:26:20:303 1572 ccc COMAPI WARNING: ISusInternal::GetEulaText failed, hr=80240033
From smsts.log:
One or more updates failed to install, hr=0x80004005 InstallSWUpdate 3/31/2015 9:26:32 AM 1392 (0x0570)
InstallUpdates(pInstallUpdate, tType, sJobID, sActiveRequestHandle), HRESULT=80004005 (e:\nts_sccm_release\sms\client\osdeployment\installswupdate\main.cpp,248) InstallSWUpdate 3/31/2015 9:26:32 AM 1392 (0x0570)
Setting TSEnv variable SMSTSInstallUpdateJobGUID= InstallSWUpdate 3/31/2015 9:26:32 AM 1392 (0x0570)
Process(pInstallUpdate, tType), HRESULT=80004005 (e:\nts_sccm_release\sms\client\osdeployment\installswupdate\main.cpp,302) InstallSWUpdate 3/31/2015 9:26:32 AM 1392 (0x0570)
Process completed with exit code 2147500037 TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
!--------------------------------------------------------------------------------------------! TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Failed to run the action: Install Software Updates 3.
Unspecified error (Error: 80004005; Source: Windows) TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
MP server http://our.mpserver.com . Ports 80,443. CRL=false. TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Setting authenticator TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Set authenticator in transport TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Sending StatusMessage TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Setting message signatures. TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Setting the authenticator. TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
CLibSMSMessageWinHttpTransport::Send: URL: our.mpserver.com:80 CCM_POST /ccm_system/request TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Request was successful. TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Set a global environment variable _SMSTSLastActionRetCode=-2147467259 TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Set a global environment variable _SMSTSLastActionSucceeded=false TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Clear local default environment TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Let the parent group (Pass 3) decides whether to continue execution TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Let the parent group (Windows Updates) decide whether to continue execution TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
The execution of the group (Windows Updates) has failed and the execution has been aborted. An action failed.
Operation aborted (Error: 80004004; Source: Windows) TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Failed to run the last action: Install Software Updates 3. Execution of task sequence failed.
Unspecified error (Error: 80004005; Source: Windows) TSManager 3/31/2015 9:26:32 AM 1540 (0x0604)
Resync'd multiple times, with no joy. And, we have 6 separate passes for updates - sometimes it fails on the the first one, sometimes on others....doesn't seem consistent.