NM> Hello g00r00 i have a strange problem...:
 NM> https://www.dropbox.com/s/3x13xu8cg7zgm89/video.mp4?raw=true
 NM> as you can see in this video when i am under standard menu (in this case
 NM> message) the box work as expected, it appear and when i press a key it
 NM> disappear but when I am on Index genera I need to press two key because
 NM> the box appear twice... do you know what could be the reason?

Where are you using the box?  I will try it out here and see if I can find the same problem.

... There are three kinds of people: Those who can count, and those who can't

--- Mystic BBS v1.12 A49 2023/01/23 (Windows/64)