I'm using Tools->Validate rather than using the Validate from the context menu in Book Browser. It seems to work as for me as well when doing it that way, too. It's only attempting to validate the highlighted files that way. But when doing it from the Tools menu (which attempts to validate all .css files in the epub), it's hit or miss with me. Sometimes the first tab is empty, sometimes not. I'm always starting with my browser completely closed.
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