I also have scrambled text in those windows - task editing window and force composition window.
Task editing window - it works fine until I edit bombard order, every other task editing window I open after editing bombard order will have scrambled text. I guess it has something to do with this window not refreshing and showing different order editing options (bombard order options and "normal" order options overlay each other, as you can see)
Force window - it happens when I open the window, switch to E&S tab, dismiss the window. From now on every Force composition window I open will have scrambled text. Unpausing the game causes this window to "refresh" itself and text shows properly after a second or two, but the problem persists for newly opened windows (one at a time, or more - it doesn't matter).
Unfortunately I cannot use panzerde method, because selecting any other option than current resolution results in black boxes (as posted in relevant thread). I have only one card (gtx 970 with latest drivers), without integrated chipset, so that should not be the issue here.