i cannot access my account shiuyi[at]spamcop.net for the last 48 hrs

It may not apply, but http://www.spamcop.net/fom-serve/cache/264.html may have some data.????

You make no mention of what error you're getting, or offer any other particulars that could be looked at here ... and there isn't a massive complaint session going on here or over in the newsgroups about other folks not being able to login in ... and two days would be more than enough for a fair number of them to show up ...