I refreshed my stats page this morning and it showed me I'd had some visits - two pages had had two visits and one had had one, or there abouts. It showed two people had referred from one particular site. I looked a little later and it showed I'd had none. I refreshed the page - no change. So I closed the tab and opened another one - problem solved.
I just reopened my browser (Google Chrome) and the stats page again showed '0' for today. I refreshed - no joy. I closed the tab - no joy.