Execution Overlay Not Appearing During Scenario Execution

I'm experiencing an issue where the standard execution overlay (loading spinner with "Please wait..." message) is not appearing when scenarios are executing in our FICO Xpress Insight 5 application.

Technical Details

• When calling scenario.execute() and .start()
•  In my code, the execution overlay that should show during processing doesn't appear
• According to documentation, this should "Start ScenarioObservers and add no-results and execution overlays to the view"
• No visual indication is shown to users that a scenario is processing
• This functionality works fine for me in insight 4, but not working since I trying to migrate to insight 5