Thunderbird "message/move to" drop down box

  johnexpgn 15:45 06 Feb 2010

Thunderbird "message/move to" drop down box is not working. The "Move to" box when clicked seems to be highlighted in a text box with a square in the top right hand corner, and the drop down location box does not appear.
I have just insatlled this on a new computer.
Any ideas how to correct this?

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