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It just means the developer didn't include code to tell the progress bar to move in the script.
Twrp relies on the Dev to tell it where its at (10%,20%,ect)
I get the same thing on twrp. The progress bar doesn't move but it is indeed flashing. When I just flashed Dec 12, I estimate it took 5 minutes or so, no progress bar but eventually finished.
Be careful if you're forcing a shutdown during the install.
12/12 worth flashing over 12/6 vers?
Along with some smaller cosmetic fixes in the ROM Its also got the bump from 4.4.1 to 4.4.2 which has voicemail and security fixes.
Meh, I never had any vm issues. Looks like I'm sticking with 12/6 build.
I'm curious. Why? Dirty flash works fine so you won't have to rebuild.

If I flashed Bootloader & Radio after installing 4.4.1, do I need to flash them again after installing 4.4.2? I did a clean install of 4.4.2.
Edit: Nevermind, I noticed my baseband is M8974A-1.0.25.0.23 which someone stated earlier is the new one.