column headers are 0 height

Hello, I am seeing the following issue, and so far had failed to track it down: when the new task is created and then displayed in the UserTaskView, the column headers in this view are sometimes 0 height (see the attached screen shot). This happens most often when the user task view is displayed the first time after the IDE had been launched. Also, if the list is displayed with ViewTasksAction, the problem does not appear. If the list is closed and then re-opened, the problem goes away. Very bizzare. Any insights would be much appreciated.

thanks,
elena (VBuilder team)