HI there,
I have exactly the same problem and it seems that others have it too.
Why is there no Development documentation on this site?!?
Is there anybody from CuteSoft tracking this forum? I found NO answer to almost any questions in here...

I integrated the messenger into our site and applied changes to the files ConnectionStringProvider.cs and DataProvider.cs in CuteChatIntegration (which I added to our project).

It kind of works but it still needs SamplePortal.dll . I have no references to this component in the whole project.
Is this example linked within CuteSoft.Chat.dll or CuteSoft.ChatService.dll?!?

If so, I have to look for another  product...

Thank for hints