问题 While debugging my Python 3.5 pogram in Pycharm 5.0.4, I am trying to hit the pause button to find how why/where the program is hanging (as can be done in Visual Studio). However, nothing happens: the pause button does not become grey and the resume button stays grey, and in the debugger tool window, "Frames are not available". I tried with different basic programs, on Linux and on Windows, to no avail. Is this a bug or am I missing something in how Pycharm debugging is supposed to work? I