Thank you for your post, and I apologize for the late reply.
I am unable to reproduce the problem with FileMaker Server 11.0v4 and FileMaker Pro 11.0v4 hosting files via Instant Web Publishing. When I click a button that executes the step "Exit Application", I am returned to the Instant Web Publishing home page that lists the available Instant Web Publishing files.
Have you tried this with a new database file? If a new file works, then we can focus on the original file itself.
Any other steps you can provide to help replicate the problem would be appreciated.
I am using Mac OS10.9. I did not update to FMP 12 or the newest versions because IWP functionality has been removed.