UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36

Steps to reproduce the problem:
1. Simple JS fiddle: https://jsfiddle.net/2xhk8udp
2. Make sure you opened the debugger via SHIFT+CTRL+I and it was a detached window from the start. If your debugger is not detached then configure it to be detached, close it and re-open it.
3. Watch the html structure, specifically the cursor attribute, of the canvas. That's not required, but is quite interesting.
4. Move around the mouse on red/green, you see the cursor changes as expected
5. Now for example move the cursor to green, press down left (or probably any?) mouse key and drag the cursor to red. The cursor changes in the html structure, but the displayed cursor won't change.

What is the expected behavior?

What went wrong?
The cursor should change normally, no matter if or how the debugger is enabled.

Did this work before? N/A 

Chrome version: 49.0.2623.110  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 21.0 r0

That jfiddle is actually from like a month ago when I first encountered this, just when I was finished making it and closed the debugger and before posting a bug report tried one last time ... to find the bug was gone. Understanding it was related to the debugger took a while...

Also you actually can do it on any page with any hovering mouse cursor, drag the mouse while the debugger is open and you'll see the cursor won't change.