bug with the new engine

when some1 leave the game, sometime my screen start to blink randomly (the map disappear and everything is at the color of background)
Sanyc also has problem and has to leave mid game everytime. Each time at the middle of the game he got a big frame drop and he can't continue playing. (that's what he say)

I think I remember this, but this is noticeable on 91 engine too, more on slow pcs probably(my laptop) I could easily see that instead refreshing minimap area it would refresh much bigger area causing sorta "blink".