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Tree Selection in Vista (highlighting)

It seems that when on my Vista computer (at home) all of the Tree examples show highlighting when doing a drag and drop.
But on XP, it looks correct.
Is this a known isssue? or is it something with my computer?

I have already tried the below:
in dhtmlxtree.css
.selectedTreeRow{ background-color : navy; color:white; font-family : Verdana, Geneva, Arial, Helvetica, sans-serif; font-size : 12px; -moz-user-select: none; }

Thanks