XmlException
 Invalid character in the given encoding. Line 1, position 1.

Source     : System.Xml

Stack Trace:
   at System.Xml.XmlTextReaderImpl.Throw(Exception e)
   at System.Xml.XmlTextReaderImpl.Throw(String res, String arg)
   at System.Xml.XmlTextReaderImpl.InvalidCharRecovery(Int32& bytesCount, Int32& charsCount)
   at System.Xml.XmlTextReaderImpl.GetChars(Int32 maxCharsCount)
   at System.Xml.XmlTextReaderImpl.ReadData()
   at System.Xml.XmlTextReaderImpl.SwitchEncoding(Encoding newEncoding)
   at System.Xml.XmlTextReaderImpl.ParseXmlDeclaration(Boolean isTextDecl)
   at System.Xml.XmlTextReaderImpl.Read()
   at System.Xml.XmlTextReader.Read()
   at System.Xml.XmlReader.MoveToContent()
   at System.Data.DataSet.ReadXml(XmlReader reader, XmlReadMode mode, Boolean denyResolving)
   at System.Data.DataSet.ReadXml(String fileName, XmlReadMode mode)
   at MicroFour.StrataFrame.Xml.XmlBasics.OpenXmlFile(String CurrentVersion, String TableName, String PathAndFileName, List`1 ColumnStructure)
   at MicroFour.StrataFrame.Xml.XmlBasics.OpenXmlFile(String Version, String TableName, String PathAndFileName, List`1 ColumnStructure, Boolean DecryptFile)
   at MicroFour.StrataFrame.Data.BusinessObjects.DbeApplicationData.FillAll()
   at MicroFour.StrataFrame.Data.ConnectionManager.SetConnections()
   at MicroFour.StrataFrame.Data.AppMain.SetDataSources()
   at MicroFour.StrataFrame.Application.StrataFrameApplication.Raise_SetDataSources()
   at MicroFour.StrataFrame.Application.StrataFrameApplication.RunApplication()
   at MicroFour.StrataFrame.Data.AppMain.Main()

C:\Documents and Settings\All Users\Application Data\MicroFour\ConnectionData

There will be two files here that need to be deleted: AppKeys.Dat and Connections.Dat.  Once these files are removed, go back into Visual Studio and you will be required to provide the connection information again.  But this will get you going.