UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.29 Safari/537.36

Steps to reproduce the problem:
1. Visit any site with minified JS (e.g. https://www.google.com/chrome/)
2. Select the script in the debugger, such as as "apis.google.com > js > plusone.js"
3. Click 'pretty print {}' button
4. Set breakpoint on an executable line.
5. Refresh the page

What is the expected behavior?
The debugger should work in the formatted code.
The formatted code should be the default pane after refreshing the page.

What went wrong?
The breakpoint is hit in minified code. Further attempts to pretty-print and step-over cause the view to return to minified code.

Did this work before? Yes Chrome 50.0.2661.86 

Chrome version: 51.0.2704.29  Channel: beta
OS Version: 
Flash Version: Shockwave Flash 21.0 r0