User #1 can block himself. I am not sure whether this is normal behavior or really a bug. To me it seems very odd that root admin account can be blocked. I did not try deleting it. I also did not have time today to install the official 5.1 release and to see if this problem is still there.

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Crell’s picture

Crell commented
Status: Active » Closed (duplicate)

I would file this as part and parcel of: http://drupal.org/node/46149