Hope someone can help me. Opened a mail attachment (a spreadsheet), probably via pdf reader but could be good reader as I have that app. I cannot return to my inbox and the doc is there when I close and re-open mail or where I switch off the ipad and re-open mail. The ipad is otherwise functioning normally. Mail attachments have previously functioned normally - i.e. a back button appears on touch so it return to inbox. Am a bit worried about re-setting as not sure what that will do to other programmes.