Cloud9 debugger

I am trying to use the Debugger function (in a Python program) on the embedded Cloud9 IDE, but can not get the code to respond to any Breakpoints. The debugger seems to be available, but the debugger control buttons are grayed out. I do not see a message “debugger listening on port xxxxxx” when stsrting up. Do I need to use a special Runner to enable debug? Anyone have a clue as to what I might be doing wrong? My code is coming along, with lots of temporary print statements, and a logic analyzer to watch some GPIO pins for tracing the flow, but an actual debug function would sure be nice!

I’m running a BBB with the most recent full image available at, which includes LxQT.