After almost three days of wondering what was happening with my Cosmology@home WU's they have put out a statement and everything seems to be running smoothly again:
"Hi all. As you might have noticed, cosmologyathome.org was unreachable for the last ~2.5 days. This was due to a failure properly reregistering our domain name after moving the server from one university to another earlier this year. In addition, as we couldn't contact you via the website, we tried to send out email notification of the issue, but due to a problem with the server software many of you did not receive this email. We'll work on addressing this so in the future it doesn't happen again. All should be back to normal now, although it may take as long as another 24 hours for the domain to fully propagate everywhere. We greatly apologize for this extended down time."
My piled up tasks have all uploaded (successfully I hope) and things seem to be running smoothly again. Seems to have been an IT department SNAFU...