I've been having this error with Open Live Writer recently.
Wednesday, November 30, 2016 10:21:34 PM
Version: 0.6.0.0
OS Version: Microsoft Windows NT 6.2.9200.0
Runtime version: 4.0.30319.42000
Shutdown started: False
Program: "C:\Users\Rams\AppData\Local\OpenLiveWriter\app-0.6.0.0\OpenLiveWriter.exe" --squirrel-firstrun
Memory Load: 76%
Total Physical: 1974 MB
Available Physical: 459 MB
Total Page File: 3958 MB
Available Page File: 1451 MB
Total Virtual: 2047 MB
Available Virtual: 1615 MB
Available Extented Virtual: 0 MB
Unexpected Error Occurred
An unexpected error has occurred within the application.
System.NullReferenceException: Object reference not set to an instance of an object.
at OpenLiveWriter.PostEditor.PostEditorMainControl.htmlEditor_TitleFocusChanged(Object sender, EventArgs e)
at OpenLiveWriter.PostEditor.ContentEditor._currentEditor_EditableRegionFocusChanged(Object sender, EventArgs e)
at OpenLiveWriter.PostEditor.PostHtmlEditing.BlogPostHtmlEditorControl.OnEditableRegionFocusChanged(EventArgs e)
at OpenLiveWriter.PostEditor.PostHtmlEditing.BlogPostHtmlEditorControl.OnDocumentComplete(EventArgs e)
at OpenLiveWriter.HtmlEditor.HtmlEditorControl._mshtmlEditor_DocumentComplete(Object sender, EventArgs e)
at OpenLiveWriter.Mshtml.MshtmlEditor.OnDocumentComplete()
at OpenLiveWriter.Mshtml.MshtmlEditor.ReadyStateChangedHandler(Object sender, EventArgs ea)
I was still able to use it last October with no problems.
Even the windows store OLW has the same error. I've done an uninstall and removed the registry keys too.
For some reason, I also can't use windows live writer and all of the windows essentials programs.