yes, sorry, been the weekend here.
When i select Tools menu > DBMS Scheduler ... it opens a window with a status bar showing the connection and thats it. there is nothing down the left panel which used to show a tree, and the right panel, which showed the details of whichever node you clicked on, is also blank.
it used to work ... and then it didn't.
is there anything i could have played with to make it blank?