Java SE (Java Platform, Standard Edition)

I have an swing application where on clicking a button a new JPanel is launched in the JFrame. The panels are contained in a CardLayout. JPanel contains a JScrollPane (containing a JTable) which does not scroll when I use the mouse wheel. Even when I click within the JScrollPane area or on the scroll bars, mouse wheel still does not work.

However, if I switch out of the window to some other application, minimize the JFrame window and restore it or launch an input dialog from a row in JTable and close it, the mouse wheel starts to work.

I have tried following solution and nothing seems to work :-(
1) Requesting focus to JScrollPane
2) Adding MouseWheelListener to to JScrollPane
3) Calling repaint(), invalidate() methods on JScrollPane, JPanel, JFrame

I am using Windows XP but the problem also occurs on Max OSX. I have tried jdk versions 1.4 through 1.6.

I will be very grateful for any help.

Thanks.