Hi 

Umbraco version 4.9.1 - it was the same on 4.9

I have this problem, i get this error.

When i try to publish without any text or with one line of text it is ok

It is a richtext editor

My document types have no illigal caracters

The funny part is that it was working for a week, and suddenly it do not work any more

Ok Her it works

When i try to paste in this text i get the error

 Here i get the error

I have tryed without the bulletpoints - it is the same - i only alloved to type 1 lines of code.

Server Error in '/' Application.
'', hexadecimal value 0x1F, is an invalid character. Line 1, position 519.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.Xml.XmlException: '', hexadecimal value 0x1F, is an invalid character. Line 1, position 519.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[XmlException: '', hexadecimal value 0x1F, is an invalid character. Line 1, position 519.]
   System.Xml.XmlTextReaderImpl.Throw(Exception e) +69
   System.Xml.XmlTextReaderImpl.Throw(String res, String[] args) +78
   System.Xml.XmlTextReaderImpl.ThrowInvalidChar(Char[] data, Int32 length, Int32 invCharPos) +46
   System.Xml.XmlTextReaderImpl.ParseCDataOrComment(XmlNodeType type, Int32& outStartPos, Int32& outEndPos) +5567909
   System.Xml.XmlTextReaderImpl.ParseCDataOrComment(XmlNodeType type) +78
   System.Xml.XmlTextReaderImpl.ParseElementContent() +294
   System.Xml.XmlTextReaderImpl.Read() +44
   System.Xml.XmlLoader.LoadNode(Boolean skipOverWhitespace) +57
   System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc) +20
   System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +162
   System.Xml.XmlDocument.Load(XmlReader reader) +107
   umbraco.cms.businesslogic.web.Document.importXml() +145
   umbraco.cms.businesslogic.web.Document.ToXml(XmlDocument xd, Boolean Deep) +46
   umbraco.content.PublishNodeDo(Document d, XmlDocument xmlContentCopy, Boolean updateSitemapProvider) +96
   umbraco.content.UpdateDocumentCache(Document d) +191
   umbraco.content.UpdateDocumentCache(Int32 pageId) +52
   umbraco.library.UpdateDocumentCache(Int32 DocumentId) +105
   umbraco.cms.presentation.editContent.Publish(Object sender, EventArgs e) +371
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   umbraco.controls.ContentControl.savePublish(Object Sender, ImageClickEventArgs e) +46
   System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) +115
   System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +124
   System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1724