I get this problem to occur on Solaris 2.6, Solaris 7, and Solaris 8.
How long did you try? I believe this is a timing issue; and in a couple
of cases with the Notepad program it took me around 30 to 45 seconds for
this problem to occur. With our applications, we've seen cases where the
user initially can't reproduce the problem; but after trying harder it
always seems to occur.

Let me re-state the steps to reproduce this problem (I've changed steps
c and d for clarity):

a. Use the demo program in $JAVA_HOME_DIR/demo/jfc/Notepad
b. Run the program: java -jar Notepad
c. Shrink the window until it is as small as it can be.
d. Select the "File" menu from the menu bar. Quickly scroll up and down
    the menu list, repeatedly. If nothing happens, deselect the mouse.
    Repeat step "d" until the problem occurs.