I'm having a problem loading websites after a yesterday's "yum update" on F13. Before that everything worked fine but now when I open a browser, websites only load for about 2 seconds, after which any website I open just goes into a constant loading loop. I tried disabling the IPv6, as some threads suggested but it didn't help and pages still won't load. It happens on Opera and Firefox, so the problem seems not to be browser related. The connection is fine too, as I it works ok under Windows.
I am new to Linux and really have no idea where to look for the source of the problem.
Any help would be greatly appreciated.