Just to confirm that I did not get a 500 this time.
I suspect that the webassist files off the /presenters/ directory are to do with PowerCMS itself, which I uploaded to that folder?
At least I now seem to have this working.
I will run some tests in a little while.
I am sorry for the trouble this has caused.
I will look carefully in all webassist folders everywhere.
Make sure that DreamWeaver has uploaded all the files on the the server that it should have done.