I just updated my 64-bits Boinc to version 7.4.36 on a Dutch Win7 64-bit OS.

After that I have the following symptoms:

- Windows SP1 64-bit not shutting down completely; all icons are gone, the background image is still on the screen, the HD light is only flickering occasionally. I arrive at the office next morning and it's still this way ;-)
- Lock screen no longer works; either through the start menu or the Win L key combination

This happened before when I updated to 7.4.27

All default update settings, I just 'click through'.
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Any mention of a reason in Windows Event Viewer?

All default update settings, I just 'click through'.

But does that mean you installed as a service, or as a user installation?
Have you moved the install paths to elsewhere?
Did you install at any time a 32bit version of BOINC and later updated that to 64bit?
Also, is this BOINC with VirtualBox or without?

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- Any mention of a reason in Windows Event Viewer?
==> The application log only shows 5 entries on 23/1 for succesful installation

- But does that mean you installed as a service, or as a user installation?
==> It runs under my normal user account

- Have you moved the install paths to elsewhere?
==> No

- Did you install at any time a 32bit version of BOINC and later updated that to 64bit?
==> I don't remember. If so, a long time and many updates ago.

- Also, is this BOINC with VirtualBox or without?
==> Without

And I noticed something else (both times): the issue is not resolved after one reboot; it requires several reboots (days?) to 'settle down'. My PC refused to lock and did not shut down properly both on Tue 27/1 and Mon 26/1 (update was Fri 23/1), it locks fine today Wed 28/1. Weird.

I've forwarded this to the developers, let's see if they can come up with a hint.

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I don't know if this complicates things or narrows it down:

I have the suspicion it is an interaction with VMWare Player.

I'm not running Boinc *in* a VM, Boinc *and* VMware Player are on the same host.