FreeRTOS threads STM32F4

I tried to use the threads window to view tasks running under FreeRTOS 10.3 on a STM32F411 target. I am using a Nucleo board with ST_Link to talk to the target.

I found threads.js under ARM7_LPC2138_Rowley and copied that into the .scr directory of my project. I added the file to the project and that appears to be recognised. I also added

#define portREMOVE_STATIC_QUALIFIER // Required for debugger "threads.js" to work properly

to the FreeRTOSConfig.h

If I hit a breakpoint then the debugger freezes for 30 sec before showing the highlight and the Threads window shows only "Ready"

Attempting to single step gives me the message "No selected context" and eventually "Ready"

Is there something else I need to do to get more information in less time?