Thanks for your help on this Robert.
It is now working perfectly. We found instructions for dropping a zip file widget package into the application builder and I tried that and it worked. I don't know why it didn't work the times I used your instructions to modify the main config file, and put the BufferDistance folder under the widgets folder -- but no problem now.
Love this Widget. Thanks so much for building it and sharing it!
(let me know if you want me to delete the posts on the Resource Center page, now we know to use the forum for questions.)