Having just received an up-vote I thought I'd double check where from:
So I click on the reputation link and get this:
The URL is
I can see that there is supposed to be some data there, but apart from today's date I get nothing. This is happening on all sites. Operating system is Windows XP SP3. Browser is Chrome v 10.0.648.127
On sites where I haven't received any votes it correctly says:
There were no reputation changes for the selected days
NOTE: I have never been able to get the reputation graph to display data for anything less than a couple of days as nothing ever happens when I enter dates into the fields. I have to use the mouse to drag the selection and that's never accurate.
From other questions and @Grace's comment it's clear that other people can see their page OK. What would be interesting would be if I could check someone else's profile page. Can someone post a link.
It appears to be working now.