"Auto-insert Feedback Nodes in cycles" option under Tools > Options > Block Diagram should default to OFF. I am a believer and preacher of FN's since Darren's blog post about them, but it seems I can only get FN's to appear when I mis-wire, not when I want one.
Plus, they really scare LV beginners (and me!) when I miswire. GAH! What just happened??
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