I think you are confusing it with conflicting commands. I notice in your movie that you switch to PNG 24, which does not support transparency.
Thanks for the reply. This is not it, ma'am, I promise. I can make another video demonstarting the same exact thing with a PNG32 (what I typically export-- which is the PNG24 with an 8bit Alpha channel).
The issue is with the software not applying my commands whatever they may be. I clicked back into settings only to have it say PNG8 again. That's clearly represented and not how the software normally functions.
I have been using it everyday for years, it's very atypical behavior.
Try deleting the Fireworks preferences.txt. That will reset all the program setting to their defaults.
Worked. Thank you!