The first year I grew Black Eyed Susan Vine, it did great. Since then, not so much. A combination of factors has worked against it - critters disturbing the directly sown seed, poor germination rates, etc. This year the problem was a mighty wind that severed the vines. I assumed that was that, but a few surviving plants regrew and climbed the trellis on the front porch and actually produced a handful of blooms.
I'm not giving up on Thunbergia alata. It grows fast, tolerates some shade, and looks good. Soaking the seeds may improve germination. Also, the clematis it is standing in for has had its own set of problems, so I still need something for that trellis.