[KevinH]

sdjskr

Sorry, your video will not work for me. It just shows an error message. If switching to CodeView and back makes the cursor reappear, then it is definitely a lost focus issue. If you lose focus when hitting spacebar or return, but not when adding composed korean characters, that means something else is stealing focus from the tab widget. That something else may not be Sigil at all.

So please try one more thing. In BookView make the problem happen, but instead of switching to CodeView and back, simply use your mouse to click anyplace inside the BookView tab or on the tab marker at the top of the screen. Both of those should change focus. What happens then?

KevinH