Hi,
The menu added by the Subscribe by Email plugin is messing up the dashboard with IE8 (it seems OK with latest firefox and chrome, I didn't test others browsers).
The problem is with the "overlay menus" (can we say that in english?) which are pushed to the top of the page. There is a similar problem with the overlay window that is opened when you try to add a picture into a post. The window is pushed to the extreme right of the screen. Please see following screenshot that shows the first problem.
If I remove the plugin, everything works fine.
Thank you
Laurent