If you open more than 20 editors in iTest, the followng errors result:
!ENTRY org.eclipse.ui 4 0 2008-10-01 17:41:03.625
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Failed to execute runnable (org.eclipse.swt.SWTError: No more handles)
Workaround: Work with fewer than 20 editors open.