Bill,
Mine bloom all the time and even got seeds from them. If that turns out to be a flower stock, then it is the first time ever in sanserieria history that that happened.
I had a rhizome root that kept up rooting my plant so I had to remove it and it was so long that I planted it up in another pot that left it half exposed. It is now forming it's own trunk but no rosette yet. It since turned all green.
Planted up the rosette back in it's own pot and is doing well.
There they are side by side. That rhizome grew a few more inches since.