Subscription menu is messing up the dashboard with IE8

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