A) For the font size outline issue, please email me the fonts you're using just so I can rule that out as a factor.
B) Shadow disappearing upon complete... These shadows will *only* work when STMMaskableGraphic is on the STM object, so that part is expected. I just fixed the other issue you reported, which could have effected this as well. (Even if it didn't return an error, it could get the wrong index of text used for a font upon rebuilding)
That said, yes I'm seeing shadows disappearing when text is done reading! I managed to track down the issue, STMMaskableGraphic wasn't applying effect data when a mesh was done reading, only while int he middle of reading. I've got this updated and optimized now.
C) That error trace seems to be coming directly from your TestActorVoice script, so I'm not sure how related it is at a glance? What is the list that the out of range exception is happening on, and what is the index it's trying to get?
I think I'll publish what I've got here so far as an update, this is a good chunk of fixes! (Look for v1.14.17!)