The live-refresh features often work nicely, but there are some inconsistencies which are a bit irritating with slower or mobile connections (but using the full site) when you pause for a moment to think whether or not it is worth to update.
Reputation count. By looking at the reputation count alone one cannot tell if the value indicated is current or not. It would be nice to have there some extra clue to this. Like fading when there has not been an update in the last x minutes.
Hover-over UTC time. What is the purpose of the last line in the hover-over summary? It shows me the UTC time. But this is not the time of the last update of the summary. In fact, I can switch off my internet-connection and the time will still continue to be updated. So again some visual clue would be helpful.