Feedback to user Workflow Instantiator is busy

System

Between pressing the "Submit" button after entering data into the workflow instantiator form and the window disappearing or the first cgitask appearing can take quite some time (there is a lot going on in the background, like regenerating, attaching output files, checking locks, checking if files are involved in workflows in other areas, etc.). Because the window does not contain the rotating browser icon there is no visual cue to the user that the process is running, other than that if they hover over the title bar the cursor turns to an hourglass. User training on this is an issue - they are likely to press Submit twice.

Any suggestions out there?