Nrf51822 and mbed does not work, however arduino works

Hallo all,
I use a chinese J link copy and the core 51822 and core 51822 (b) and a Ebyte E73 (all with a nrf51822).
I first I tried to program the core 51822 with a ble400 motherboard and the jlink copy. I used one of the examples. This worked fine. However when I just use the four pins of the Jlink the same code does not work anymore.
Then I switched to the core51822 b and the module E73. They did not work at all if I try to program them with the mbed examples. However If I use the arduino examples all works fine (so I guess the connection must be ok). Anyone had simular problems?

Kind Regards,