We have a randomly consistent issue (:D).
We are using STM to display dialog text for characters in our game using the Unity UI. It worked fine in Unity 5.6 but we recently made the upgrade to 2017.3.0f2 and to the latest version of STM.
I don't know exactly what causes the issue but sometimes when updating the dialog box text, the name of the character (on a separate game object) messes up like if something got recomputed with the font texture and the text was not updated.
Here's the example: all was displayed fine, I updated the TextPanel/TextText STM and suddenly the NamePanel/Text got messed up.
It doesn't happen all the time so it's hard to investigate what causes it or make a test project.
Got any ideas?