Perhaps a related problem; last day or two, and particularly (uniquely) with Pprune.
Main page opens albeit slowly, but none of the linked pages will open in tabs.
Running Windows SP; Firefox V5 and also a problem with IE. Norton360, ZoneAlarm.
Other web sites appeared to be OK.
However some web pages on IE appeared to have been hacked with adds from ‘clickserve2.sitescout.com’ I didn’t investigate further!
Shutdown, reboot and scan, no problems found and the origional issue has disappeared overnight.