FAB - square on pre Lollipop and without shadow on Lollipop

Question

It looks like FloatingActionButton is not working ether on Android 4.0 and Lollipop. As you can see on image below, on Android Lollipopo shadow is missing and o

Answer 1

@Raghunandan, I have same problem on Lollipop also.
Finally I find that the root cause is a drawable named "fab_background" in my drawable folder.
The drawable is previously used for my own fab implementation.
Now I can see round fab after I rename this drawable.