My wife has a 2006 low-end Macbook running 10.5.8. In recent months she's noticed that text will inadvertently hightlight while she's typing, and it will then be deleted. While she could CMD-Z or whatever command to undo it, that seems to be a fix for a problem that shouldn't be there. Anyone seen this happen? I only ran across one problem when Googling for an answer, and there was no solution there. MRoogle seems to have no help, either. Any ideas would be helpful; thanks!