Kepler

I'm not sure how to describe this bug -- but it appears that when we made
changes somehow Kepler was not picking them up. Two of our uses got similar
errors during one of the exercises. The error message returned was:

in .veg_data_2_jg.Expression To Token2

The ID FPC is undefined

or we got The ID Height is undefined.

This made no sense to us because these ports were defined and defined
correctly. We triple-checked to make sure we had everything entered correctly
and we did. We checked against our instructions and we checked against other
people's configurations of the Expression to Token2 actor and it was exactly
the same. However, as noted a few users got these error messages and we were
unable to clear them, even re-entering the correct configuration.

This seems to be a symptom of Kepler sometimes not "picking up" changes for
some reason.