How to reproduce:
1. Open the attached "2017.1b7 FrameDebuggerBug" project
2. Go to File --> Build settings --> Player Settings and choose Direct3D9 as a default Graphics API
3. Go to Window --> Frame Debugger and enable it
4. Make sure the Game view window is visible and click on one of the drawcalls in the Frame Debugger list

Expected result: Clicking on an item from the list will show Game view as it appears including that drawcall
Actual result: Game view is not rendered

Notes:
1. When clicking on Camera.ImageEffects, Draw Dynamic and Camera.Render, Game view seems to be rendered okay
2. Not reproducible with other Graphics API's

Regression introduced in - 2017.1.0b2
Reproducible with - 2017.2.0a1, 2017.1.0b8, 2017.1.0b2
Not reproducible with - 2017.1.0b1, 5.6.1f1

Fixed in 2017.2.0b7