I have just upgraded ALO EasyMail to 2.4.13 (French) on WP 3.4.2 (my web site : http://www.lecoledanslepre.com using Museum Core theme) and when I clicked on Bulletins menu to access to the plug-in settings, the message "Alors, on triche ?" was then displayed (instead of the plug-in page showing the list of newsletters managed). And the plug-in has disappeared from the interface. No way to get it back again in the left menu of WP interface! Checking the installed extensions, it is still listed as Installed.