I've noticed different behavior when opening the event fields box. When I click on the timestamp, it behaves normally, but if I click on the event itself, the browser scrolls upward, forcing me to scroll down to view the box. This isn't a big deal if you know the difference, but if you don't, it's really annoying and could turn away potential users. This happens to me both on Firefox and Chrome.
No work will be done on the current logstash-web and will be replaced by Kibana ( www.kibana.org )
Currently there are 2 options.
1) Wait until Kibana is runnable from logstash.
2) Run kibana your self.