about the Font hack and the K4

i tried it awhie back and i had some issues.

(some menus not displaying right. some books not opening. nor would some active Content would open i would get a generic error message box with nothing inside)

been a bit gunshy on doing anything to my K4 considering the trouble i've had with my K3. any idea Why it went awol like that? (and that was default fonts too.)