Is there an error status number that appears, or that the timer just kept on going? Could you be able to provide a screencap of it?
If by any chance, aside from making sure that you have the newest updates of Adobe Flash ( there are two plug-ins; one for IE browsers, and another for Non-IE browsers -- you need to install both
) Do manually check if they are up-to-date -- the current version ( as of this thread post date ) for both plug-ins should be at v22.214.171.124
Another thing to try -- first, safely log out; then clear out your browser's cookies and cache ( for Firefox, press CTRL+SHIFT+Del at the same time, and make sure there are check marks on the Delete All window that will appear in the browser screen
) When that's done, log in and try again