There was a strange bug in beta 7 where sometimes all message and floating +/- texts would stop. Thankfully first-time rogueliker and very observant player Dave noticed that Leprechauns were to blame!
The bug is now fixed in build 577 (see the News button in-game for the build number, you may need to Reload the page).
Of course, Leprechauns where not literally stealing the text. But they are the only creatures that I gave no preferred dungeon branch. So once I actually added a branch, that preference kicked in... in the form of an unexpected null.
Anyway, I just thought this was amusing. And thanks, Dave!