Server Error in '/' Application.

The 'br' start tag on line '440' does not match the end tag of 'body'. Line 441, position 3.

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: The 'br' start tag on line '440' does not match the end tag of 'body'. Line 441, position 3.

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: The 'br' start tag on line '440' does not match the end tag of 'body'. Line 441, position 3.]
   System.Xml.XmlTextReader.ParseTag() +2328
   System.Xml.XmlTextReader.ParseBeginTagExpandCharEntities() +1478
   System.Xml.XmlTextReader.Read() +216
   System.Xml.XmlValidatingReader.ReadNoCollectTextToken() +38
   System.Xml.XmlValidatingReader.Read() +14
   System.Xml.XmlLoader.LoadCurrentNode() +611
   System.Xml.XmlLoader.LoadDocSequence(XmlDocument parentDoc) +49
   System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +102
   System.Xml.XmlDocument.Load(XmlReader reader) +72
   System.Xml.XmlDocument.Load(Stream inStream) +95
   CommunityServer.Components.XmlEmailTemplateProvider.LoadEmailTemplates(String language) +437
   CommunityServer.Components.XmlEmailTemplateProvider.GetTemplate(String emailType, User userEmailTo) +146
   CommunityServer.Components.Emails.GenericEmail(String emailType, User user, String[] cc, String[] bcc, Boolean sendToUser, Boolean html) +24
   CommunityServer.Components.Emails.UserPasswordForgottenUID(User user) +647
   CommunityServer.Components.User.SendChangePasswordUID() +25
   CommunityServer.Controls.ForgottenPassword.SendPassword_Click(Object sender, EventArgs e) +96
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +108
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +57
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +18
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
   System.Web.UI.Page.ProcessRequestMain() +1292

Version Information: Microsoft .NET Framework Version:1.1.4322.2300; ASP.NET Version:1.1.4322.2300

I re-installed the CS with a different database - so all files have been renewed.
The 'Recover forgotten password' worked just fine in the new installation.

However, the problem reoccurs when I change the database connection string back to my active (and populated) database.

I don't know what to try next... I need the old (error-causing) database for its content.
Please advise...