SharePoint Workflow Deleted Task

Thank you very much for coming back to me and providing your workaround, very useful thanks!  I ended up calling Microsoft and I found that this form was specified on the Content Type - Microsoft was going a different route but their assistance did help in part.  If you use SharePoint designed to go to the affected list, and then click on the content types, on the right it has a section to specify forms specifically for the content type and these were overriding the forms on the list.  I deleted the references to WrkTask.aspx on all content types and everything is working now.  Still don't know where that form name came from in the first place.  Thanks again.