Sometimes it happens that after the debugger stopped on breakpoint, the continue button is disabled, and Creator issues the following log:

MSG:  "QUIT DEBUGGER REQUESTED IN STATE 16"

On the attached picture (orange numbers):

1. We are stopped on a breakpoint.
2. Continue button is disabled.
3. Log message: MSG: "QUIT DEBUGGER REQUESTED IN STATE 16"
The only what the user may do is to stop debugging and start from scratch, hoping for more luck.

I think you have a better chance of reproducing this if you stop the previous debugger run with the red square button and try again.

Additional info:

• Both qml/cpp are set to Automatic:
  
• Usually 2 debuggers are running (state OK), but sometimes only qml is running - and this is the broken state when Continue button is disabled: