Tooltips always appear below the current cursor position. If you have a multi-line tooltip (produced using codes) which is taller than the space between the cursor and the bottom of the screen (the physical screen, not the window), it flickers on and off rapidly.
Hmm, I’m not seeing this. My tooltips adjust for the screen size, appearing higher than normal if they would otherwise go off the screen.
Please report your OS and version of Java.
Windows XP Pro, Java 1.6.0_20. I’ve now tested it with a client running on Ubuntu 10.04 32-bit, Java 1.6.0_18. Instead of constantly flickering, the tooltip briefly appears and then disappears - if you move the mouse over the control it briefly reappears before disappearing again.
I’ve noticed that there is always a problem if you have not displayed a tooltip in another control before moving over the control. If you display a tooltip in another control and then move over it, it is generally (but not always) OK.