Greetings.
I have upgraded recentrly my 5.5 R2 to last version (v5.5.4136 R2).
After that, when trying to add new blog post (regardless - using "New..." button or via XML-RPC), I'm getting following error:
"Exception Details: System.Xml.XmlException: Root element is missing.
Source Error:

Line 87: {
Line 88: xmlPinged = new XmlDocument();
Line 89: xmlPinged.LoadXml(value);
Line 90:
Line 91: if (xmlPinged.DocumentElement != null)


Source File: d:\Sites\Kentico\CMSModules\Blogs\FormControls\PingedUrls.ascx.cs Line: 89

Stack Trace:

[XmlException: Root element is missing.]
System.Xml.XmlTextReaderImpl.Throw(Exception e) +76
System.Xml.XmlTextReaderImpl.ThrowWithoutLineInfo(String res) +61
System.Xml.XmlTextReaderImpl.ParseDocumentContent() +3979720
System.Xml.XmlTextReaderImpl.Read() +151
System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +112
System.Xml.XmlDocument.Load(XmlReader reader) +108
System.Xml.XmlDocument.LoadXml(String xml) +113
CMSModules_Blogs_FormControls_PingedUrls.LoadXML(String value) in d:\Sites\Kentico\CMSModules\Blogs\FormControls\PingedUrls.ascx.cs:89
CMSModules_Blogs_FormControls_PingedUrls.LoadFromXML() in d:\Sites\Kentico\CMSModules\Blogs\FormControls\PingedUrls.ascx.cs:105
CMSModules_Blogs_FormControls_PingedUrls.OnPreRender(EventArgs e) in d:\Sites\Kentico\CMSModules\Blogs\FormControls\PingedUrls.ascx.cs:75
System.Web.UI.Control.PreRenderRecursiveInternal() +80
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842


Version Information: Microsoft .NET Framework Version:2.0.50727.3620; ASP.NET Version:2.0.50727.3618
"

I'm using 3.5 version of CMS. Before upgrade - everything seemed to be ok, current blog posts are also displayed, but something is going wrong on adding new post.

Thanks in advance for any help.