Clicking that link tells me (I think) that I'm using MSIE7. So, that would appear to solve that particular issue. I thought I was on a more receent IE version.
I also just looked around the forum threads and found that others have had a similar question to ask re: 'view by country'. I just tried using the dashboard with Firefox and that works (I can see the 'view by country' stats, and I can also use Reader in Firefox, which didn't really work in IE). I think I'm also using compatability mode in IE, by the way (it helps with another site I regularly visit).
So, I guess the answer for me is to 'view by country' using Firefox. Thanks for your prompt reply.