FULL PRODUCT VERSION :
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Client VM (build 11.0-b15, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows XP 64-bit, Windows XP SP3

EXTRA RELEVANT SYSTEM CONFIGURATION :
IE 6 and 7

A DESCRIPTION OF THE PROBLEM :
An applet has a JDialog which contains a JComboBox. In update 10, when selecting the combo box in the dialog, sometimes the dialog disappears. This did not happen using previous 1.6 versions.

Upon further investigation, it looks like when the combo box is selected, the dialog moves behind the browser making it appear as if it has disappeared. The z order when the combo box is selected is: combo box (top), applet/browser and dialog.

I also found other people experiencing the same problem:
http://forums.java.net/jive/thread.jspa?messageID=257353&tstart=0


REPRODUCIBILITY :
This bug can be reproduced often.

Release Regression From : 6u7
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.