Well, I see now that org-plus-contrib has its issues.  Specifically I am
hitting the same issue as reported here, which I see has been a problem for
nearly 2 years.
https://github.com/purcell/emacs.d/issues/297

Therefore, unless I hear another idea or an objection here, I intend to
proceed with getting ox-taskjuggler in isolation onto MELPA, unless its
author and/or maintainer would prefer not.

cheers,
Simon

>
> On 5/08/2017 10:51 PM, "Adam Porter" <adam@alphapapa.net> wrote:
>
>>
>> Actually all you need to do is install the org-plus-contrib package from
>> ELPA, which includes contrib.  Then you'll get the latest release of
>> Org, too.  ;)
>>
>>
>>