Hi Adam,
Thanks again for taking the time to have a GoToMeeting with me.
For the benefit of other users, the cause of the problem turned out to be the directive <identity impersonate="true"/> in my Web.config file.
When we changed this to false instead of true the upload feature worked properly.
However unfortunately this isn't an option for me. To get normal file uploading working (not using CuteEditor) the hosting company I use requires impersonate to be set to true. Therefore I will be reverting to version 5.3 of CuteEditor.
Adam, can you investigate whether the upload functionality of CuteEditor could be modified to work when impersonate is set to true?
Thanks,
Mike.