I now get the following errors after upgrading qmailadmin & vpopmail when trying to add a mailing list through qmailadmin.
This may be a known problem in qmailadmin that was fixed in 1.0.20. Download qmailadmin 1.0.23 from <http://sourceforge.net/projects/qmailadmin/>.
Taking a closer look at the logs though, it appears that you have regular ezmlm installed, and not ezmlm-idx. Is this the case? You should only see the list of options (like moderated lists) if you have ezmlm-idx installed.
After a quick look at the qmailadmin source though, I see that it's completely broken for non-idx installations of ezmlm.
Please try switching to ezmlm-idx and recompiling qmailadmin. I'll work on getting the next release to work properly with non-idx installs.