It looks like there is a UI error in Android Studio (1.x, 2.x and 3.x).
For me, the Frames / Threads panel was completely hidden behind the toolbar, so I had to resize it from the variable panel by dragging its left border to open Frames / Threads.

[I must admit that @Greg added this image after considering my answer!]
longilong Aug 03 '15 at 15:48 2015-08-03 15:48
source share