There are several bug reports since angularjs 1.1.5 added this problem:
- https://github.com/angular/angular.js/issues/2898
- https://github.com/angular/angular.js/issues/2898
- and others ...
This bug ist fixed in release 1.2.1 which is available for download.
Changeset: https://github.com/angular/angular.js/commit/d4d34aba6efbd98050235f5b264899bb788117df