Same issue here. Just found it today, appears to have been happening over the last 4 days or so. In a similar thread, someone else suggested you cannot have both email AND admin verification selected. Seems this started happening right about the time I turned them both on. Would be cool to get this remedied, as my hands/fingers are pretty sore from fixing the missing usernames manually, in the dB.
I do also have MiniMeta Widget plugin installed. This was installed long prior to the issue, however. No new plugins installed between no issue and when the issue popped up.
Thanks.
