Del.icio.us - yet again

Has anyone else had problems with their Del.icio.us account ? Mine seems to have dropped off, not recognising my username or password. I've sent for help to set another password - haven't had a reply yet, but it's infuriating as I have been asked to find out about spinocerebellar ataxia for a friend who's partner has just been diagnosed with it and wanted to share my findings (now I can !!)