Java Windows Misbehaving

I'm not sure where I should be posting this question about Java, but since the problems started after updating the OS, I'm asking it here.
Since upgrading to OS 10.4.7 a couple of weeks ago and installing the latest Java files, I get weird behavior when using any of the three colored buttons at the top left of any Java window.
If I click on the red button, the window will minimize into the dock, as if I had hit the yellow button.
If I hit the yellow button, the window will minimize correctly BUT it will minimize other, non-Java windows as well.
At times (I can't figure out the pattern) the window will close, and/or other windows will close, Java or not.
I use Firefox 1.5.0.6. Is this a Firefox bug or a Java bug?
Thanks for your help!

bump
I need your help, please.

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