I had the following experience today (9/9/13):
Warning, 9/9/2013, 7:50:49 AM, VMWare Tools
Error, 9/9/2013, 7:50:49 AM, VMWare Tools
Warning, 9/9/2013, 7:51:04 AM, VMWare Tools
Error, 9/9/2013, 7:51:04 AM, VMWare Tools
Warning, 9/9/2013, 1:46:51 PM, VMWare Tools
Error, 9/9/2013, 1:46:51 PM, VMWare Tools
Warning, 9/9/2013, 1:47:03 PM, VMWare Tools
Error, 9/9/2013, VMWare Tools
In each instant:
Error Type: Event ID: 1000
User: NT Authority/System
Description of Errors:
[critical] [vmsvc:Glib-GObject] file ..\..\..\gobject\gsignal.c: line 3062: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Description of Warnings:
[ warning] [vmsvc:Glib-GObject] invalid (NULL) pointer instance