Little gray box appears after changing preferences

I'm under FF4 on Mac OS X 10.5.8. Everytime I open the preferences panel and close it, I get a box of gray px 100 x 100 which blocks the left upper corner of the screen (and will even on windows from other applications). The box goes away if I stop FF, but reappears if I open and close the preferences panel.

This also happens in safe mode.

Here is a screen shot cropped showing box.

Mozilla are aware of this problem and are trying to establish the cause.

Tags: Firefox

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