I am using the following css to change background color of navbar dropdown active link.
.navbar .nav > li.dropdown.ope
It would be a lot easier if you could make a jsfiddle. if not then here is what you can do.
1- make sure that the tab Added lies exactly in ".nav .nav-tabs > li.dropdown.open.active" classes and the path is correct. IF not, it wont work.
2- So, find out if you have added a class that is not relevant or you have not added a relevant class.