Last modified: 2007-06-09 17:33:45 UTC
There seems to be an Off-By-One error on a blocklist with exactly fifty blocks in its history, such as [http://en.wikipedia.org/w/index.php?title=Special:Log/block&page=User:169.244.143.115]. At the bottom, it says "Next 50", which if you click on it, will show an empty list, because there are only 50 blocks. I don't know if this applies to user-contributions lists or article-history lists, but it might.
This should have been fixed when Special:Ipblocklist moved to a Pager backend...