There was during execution an interactive resgression tests suites
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TEST - 4340913 4419207
 -- dnd (drag and drop) does not work in Java Plugin
 
Instructions:
1. Open a Terminal window and set NPX_PLUGIN_PATH variable pointing
   to appropriate JRE installation path where javaplugin.so file exists
2. Open a Netscape Browser
3. Load the following file
/export/home/JQA/142/regression/142_11b2/work/classes/CTE_REGTEST/Generic/434091
3/Test.html
4. A applet will be loaded and there will be two lists
5. Try to drag and drop from one list to other
6. Resize the browser window and try step 4
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point 6 - Just do the resize after maximize and minimize browser two or three times.

The log from java console is attached.
I could not reproduce it on b01 so seems it's a resgression bug.