Sorry..but I think to understand where is the problem!.
CuteSoft editor expects the html pages to exam are resident on the same virtual directory where is present the editor!.
In my case I have the CuteSoft editor under the virtual dir /webEditor whereas my pages under /sites so that, when it creates the absolute path, merges the two path erroneously.
For me this is an error of your implementation.
Can you suggest a workaround ?
Best regards