Regarding the unsecured popup...this is not a problem with SmarterMail, this is a security setting in all browsers.  It is intended to alert people that are connected to an HTTPS connection that there is HTTP content being viewed.  The only solution is to login to SmarterMail using HTTP instead of HTTPS:   http://ultimamail.net

Regarding the popup menus....I'm not exactly sure what you mean.  Do you mean like hovering over the Action menu item?  It always disappears for me almost instantly after I move my mouse out from over the menu.  I've not had any problems where the menu stays visible.  What browser are you/your clients using that have this problem?