CMSIS_RTOS_RTX problem with timers

IN my case, it is FATFS and SDMMC. FATFS itself works, RTX itself works. When I put them together, I got error (Default Handler) or Stackoverflow (caused by Mutex Take ) and eventually the task for fatfs test does not at all get started, whereas other tasks in the same program runs fine.
I am not using any dave apps. However, the SDMMC part is difficult for me since the Reference Manual is just kidding and simple, easy life for the writer of a reference manual :).

I repeated the request in another post : XMClib SDMMC example.