A Java Applet extends JApplet and uses a JLabel with a ToolTipText.
When the applet is run in an IE browser, the JLabel does show the
ToolTip just fine, when moving the mouse over the JLabel text.
After a refresh of applet however, the ToolTip is only shown as a
small bar located below the cursor, containing no more text. This
behavior persists until the browser is restarted.

The behavior was introduced in Java SE 6 Update 22, and is
reproducible with Java SE 6 Update 23.
Java SE 6 Update 18, 19, 20, 21 were fine in this respect.

The incorrect behavior is reproducible on:
- Windows XP SP2
- IE 7.0.5730.13
- Java SE 6 Update 22 (b04)
and
- Windows Vista Enterprise SP1
- IE 8.0.6001.18943
- Java SE 6 Update 22 (b04)
and was also reported for
- IE 6