If this is the issue I think it is ( https://github.com/twitter/bootstrap/issues/4550 ), it is unfortunately not only for this beta v3, it is a big problem with the current version of Bootstrap as well.

I would consider it quite crucial. When using Bootstraps responsive features, (which are clearly a selling point) you'd expect something as trivial as a popup-menu to actually work on other than desktop devices.

Don't support Nexus4 either...