The page is a “create an article” type menu item. The Easy File Uploader module is inside an article (using the Modules Anywhere plugin extension) which is inside a module (using the Articles Placed Anywhere extension) which is assigned to a position on that page. I also tried assigning the Easy File Uploader to a module position by itself on that page (ie, without the nested module in article in module) and it still didn’t work. As I said in my original post, I do not want turn on SEF.
Please close this ticket… I tried a different file uploader extension and it works. I like your overwrite yes/no option better than your competitor’s backup option, but I can’t spend any more time on this.