My Flash plugin in Firefox 3 stopped working for some reason yesterday -- I was just getting a blank square where it should be. I tried uninstalling and reinstalling flashplugin-nonfree, but when it got to the bit where it downloaded Flash, it came up with an Error 404 message and couldn't download it. However, Firefox then showed a "Plugin required" message rather than the blank rectangle. I then downloaded the Flash rpm from the Adobe website and installed that using alien and dpkg. Now flash-plugin (not flashplugin-nonfree) shows up as installed in Synaptic, but Firefox is still showing the plugin as missing. I've no idea what else I can do to persuade Firefox that Flash is installed. (It would be nice to know what caused it to disappear in the first place too!) Any help appreciated!