Actually, I have had this happen....
In my case, I had raised the monitor resolution, and then moved my palette to the far edge of the screen, then decided I didn't like that resolution and switched to a smaller one.
I fixed it by going to "Window" menu and selecting "Reset Palette Locations". Granted, it moved all my palettes from where I left them, but I had my toolbox back. The Jhereg
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I never lie.
I'm building a reputation for honesty so I can blow it when something big comes along... This ain't it.