I played around with the profile and window. I dettache and docked the window of editor. Now what I experienced that every time I moved a way from the netbeans, performed other activities, and came back to the source, I can not locate the cursor to edit. I can see the bar moves as I scroll. that is it. And I have to constantly reset the window to start edit.
Can some mone points me what I have done and to reverse so it comes back to normal. Thank you very much.