Workspace no longer works when using flex application as Form
I've got a problem in the Workspace with one of my process that use a flex application as form.
I used the tutorial "Creating Flex® Applications Enabled for LiveCycle® Workspace ES" to create the flex application and it works well in the workspace (displays ok and datas well passed to the process).
The task completes well because my process fires the next step with all the datas filled in the task.
But after the end of the task (when I click on the submit button of the form) the Workspace is no longer usable.
I can no longer access preferences, messages, starting process panel... when a click on an item in any Menu nothing occurs. Everything is blocked.
I must restart the Workspace to be able to use it again.