As of merlin-beta2-b73, changing the display mode while Java app is running on a Windows 98 machine with more than one display enabled causes a crash. This easily is demonstrable with any standard demo; I used the DitherTest demo applet.

* start up the demo
* change the display depth

My machine spit out the following:

j:/jdk1.4/win/bin/java sun.applet.AppletViewer file:j:/jdk1.4/win/demo/applets/DitherTest/example1.html

An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x6D06BBE5
Function=[Unknown.]
Library=(N/A)

NOTE: We are unable to locate the function name symbol for the error
      just occurred. Please refer to release documentation for possible
      reason and solutions.


Current Java thread:
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(WToolkit.java:222)
at java.lang.Thread.run(Thread.java:579)

Dynamic libraries:
0x7CC00000 - 0x7CC1D000 D:\WINDOWS\SYSTEM\IMAGEHLP.DLL

Local Time = Mon Jul 30 20:31:37 2001
Elapsed Time = 28
#
# The exception above was detected in native code outside the VM
#
# Java VM: Java HotSpot(TM) Client VM (1.4.0-beta_refresh-b73 mixed mode)
#
# An error report file has been saved as hs_err_pid4294770665.log.
# Please refer to the file for further information.

This is not reproducible w/ b72.