I had the same problem after instalation IE8.
Some extensions, i.e. any_tag_close caused it.

This solution helped me:
http://forum.pspad.com/read.php?2,48650,page=2

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<http://forum.pspad.com/read.php?2,50715,50735>
PSPad freeware editor http://www.pspad.com

Odpovedet emailem