This probably because of the EurelaSim Plugin Ribbon Toolbar UI XML Encoding Problem. If you happen to Encounter this Error open the Plugin Ribbon Toolbar XML File (html1.htm for VC++ found in the source Plugin folder) in notepad or Notepad ++ . Put a space or line inside the XML Tags and Save the File. Then try to load it . It should load.. See the attached Picture for more details.
Let me know if that worked for you..
Tom
Attached File