Thank you for using our services.
Are you sure that you're using the correct backend theme (from SDK 5.0), since I tried it on a project and can't reproduce the problems that you experience. It works properly in IE9, IE8 and IE7. Please find the Backend theme below. Apply it to your project and let me know if the issue persists.
I already responded in your other thread. It would be easier if we could keep the communication in one place only, so I'm closing this ticket for now. Feel free to reopen it if needed.