This really is down to your own set up.
Let's apply some logic here:
Firstly 43,000 visited the site yesterday and nearly 50% were logged on. 3,000 of them made posts, checked mail or altered some portion of their settings.
Secondly PFL has settings that work on one machine and not another. We do not sit here at the Towers monitoring whether naughty people log on from work and block their cookies - however, that could be a way of us making shed loads of dosh
Options:
Do as Danny suggests
Use another browser
Create another username with a spare e-mail address and see what happens.
Log on from other peoples' machines - if they're OK you've simply got to accept you're probably using Bill Gates software and anything can happen
Regards
Rob