>>> "Berry," == Berry, Charles <ccberry@ucsd.edu> writes:

   > I cannot reproduce your export issue with org 9.1.14.
   > You need to provide more details.

Sorry for the noise. I just realised that a very very long time ago I
installed a function  remove-src-blk-export, which, uhh, removes source
blocks. 

I removed that function and everything works as expected.