Just trying to delete all the documents, and did this:
http://localhost:8983/solr/update?stream.body=%3Cdelete%3E%3Cquery%3E*:*%3C/query%3E%3C/delete%3E <
http://localhost:8983/solr/update?stream.body=%3Cdelete%3E%3Cquery%3E*:*%3C/query%3E%3C/delete%3E
Remember to clear the browser cache! I thought I was having the same problem, but it turned out that the browser had just cached the result and was returning the cached page. D'oh!