Usually happens to me about once or twice a month on this website. It's taking about 5-10 seconds for each turn to register (occasionally 15-20 seconds, but that's the exception). Rebooting computer did not help at all. :-(
No you weren't alone. The severs(s) have been restarted in the meantime, so should be working again normally. Sorry for this taking a bit longer to clear up, but apparently detecting the problem algorithmically is not as easy for a human.
Ingix,
Much thanks for the response. No worries :-)