Looks like a special check/update is processed when:
-you open combat options (click on button is sufficient)
-select a spell in magic book (no need to cast)
-move/attack with creature (or maybe is triggered by next creature moving, hard to check, is going fast)
I tried all other buttons/actions, only those three options trigger battlefield redraw.
(This post was last modified: 28.10.2014 20:13 by Valery.)