I created a customized security symbol, as prompted by Yahoo. It is supposed to appear on the mail sign-in page when using my computer. It worked fine initially. Now, my symbol no longer displays; I can see a faint placeholder there. The program still "remembers" my username choices. When I use Internet Explorer, my customized symbol still appears on Yahoo's mail sign-in page, so it does not appear to be a Yahoo-based problem. Do you know how to fix this (or what my next step should be rule out possible causes, etc.)?