I think when the text is black, it is hard to read (happened a lot around Boris), because the text outline is an alpha black, and the background is also.. alpha black.
Not sure I encountered any bugs while I played. One thing, opening the secret passageway in the metalworker's place (it was musty and you emerge behind the shop), first time I approached from above and it cut straight to the black screen, then when I tried again, I saw the animation of the passageway appearing before it entered the black screen. Seems like the first time I tried it was glitched.