[AUCTeX] Prettify again

[gojjoe]

Dear All,

I have Emacs 24.5.1 (2015-04-11, Windows port) and AUCTeX 
11.89.1 (2016-01-31), and prettify-mode does not work on a 
tex buffer. Even if I start Emacs with an empty init file.

Now, there have been several posts in the past (started by 
Uwe and Marcin) about prettify & AUCTeX. I've been 
re-reading them but am still a bit confused. Init-file-wise 
I tried some suggestions by Tassilo from those past posts, 
but they don't work; nor does disabling & reenabling 
prettify-mode and font-lock-fontify-buffer several times, as 
was also suggested.

Did I understand correctly that the problem should disappear 
with later AUCTeX versions? Or with later Emacs versions?

Thank you very much for any info!
J

PS: In case my motivation interests you: I happily use 
AUCTeX's Preview, so have never worried about Prettify so 
far. Recently some people tried to force me to use Lyx, and 
I'm resisting as much as I can. One of their points is that 
Lyx can show "pretty" mathematics on the fly, without the 
need to partially run latex on the file, unlike Preview. 
That's why I wanted to give a shot at Prettify.