Hi Michael,
I was also having this problem of code freezing at the 'Radio.begin()' command. This problem seems to be particular to Energia 10, since using same code through Energia 9, i found no problems.
I haven't investigated the root cause of this, but to me, it seems to be either in SPI or Interrupt code of latest Energia release. I'll look at it in few days
In the meantime, I just used Energia 9 instead of 10
Rohit