Figures popping up during running of test suite?

[Rik]

I seem to be getting flashes of figures when running 'make check' or
__run_test_suite__ from within Octave.  I thought we had addressed this
problem by making all of the BIST code use invisible figures.  Is that not
right?  Or have some new tests been added which aren't following the
convention?

--Rik