I just shipped a bugfix update that fixes signing issues on 10.11 (identity unconfirmed messages) and screen size issues on iOS9. Enjoy.
If you need the screen size fix for an existing project, copy over the index.html from a new project to your existing one.
WOOPS. This build had problems on Yosemite. To revert, download: https://rink.hockeyapp.net/apps/3b9e89e00afe47f1ef694090fe1a3e94