More link at base of twitter blocks is broken

I've enabled the Twitter and Views modules and I'm using the provided blocks, ie. All Tweets and User Tweets. For my user, the tweets are displaying correctly. However, the more link at the end of the list has an error. It links off to: http://mysite.com/users/%2A/tweets. Note the %2A. The user in question is user 2, so I think the link should be http://mysite.com/users/2/tweets.

Intriguingly, clicking on the link does not result in "page not found", but rather an empty page with the title: 's tweets.