Here's what I have discovered
Okay, since this happened again, I again renamed the configuration folder and removed every single extension I had installed. All extensions were installed through the extension manager from a fresh download of the product.
I opened DW to make sure all was okay and it was.
I started by installing site import 3.0.3 and opened DW, activated the extension and all is okay. I even imported a website to test it.
I installed many other non WebAssist extensions and after every extension I installed I opened DW and opened Site Import...no errors with it or other extensions.
I installed WebAssist Universal Email 4, I got no overwrite message in the extension manager, opened DW, activated it just to get it going and then closed it. When I tried to open SiteImport 3.0.3 again I got the same error message that started this. The error seems specific to Site Import, when I open UE4, there is no error.
In this experiment I can only conclude that there is some kind of error in the WA extension(s) that is not allowing it to work well with it's sister extensions. Am I wrong given the process I just followed?
What's my next step?
Please help, I can not keep going through this!