new members not shown

When a new member joins my site, the new profile isn't shown in the membersblock on the homepage.

I set my membersblock to "latest" as default.

I use D7-RC2

Anyone an idea to solve this?

Are you sure you haven't set your moderation setting so they must be approved by admin?  Have they verified their email addresses?

I have automatic profile activation enabled.

But its not on all new members.

some new created profiels are in the list, others not

sounds strange isnt it?