David,
There can be some confusion on terminology and where to do the setup.? No guidance for your issue, but will draw your attention to this, should it be relevant.
. . . For historical reasons, Signal Head appearances are defined using Turnouts . . .
.. and not the JMRI Lights table.
?
.. and perhaps neither Lights nor Turnouts tables are used.
Suggest starting here.?
?
Regards,
?
Ash__
