The block which you mentioned is meant to be cleared after five minutes (there is a longer one for attempts to create accounts that is 24 hours). Either it was not cleared for some reason, a cached page was incorrectly presented to you rather than sending your request to the actual server, or there is a bug in the code.
This issue has been reported on Dreamhost's MediaWiki hosting as well; I suspect it depends on the server configuration. I'll take a closer look over the weekend.
The block which you mentioned is meant to be cleared after five minutes (there is a longer one for attempts to create accounts that is 24 hours). Either it was not cleared for some reason, a cached page was incorrectly presented to you rather than sending your request to the actual server, or there is a bug in the code.
This issue has been reported on Dreamhost's MediaWiki hosting as well; I suspect it depends on the server configuration. I'll take a closer look over the weekend.