I am using tilda in openbox.
Until I enabled "Double Buffering" in tilda, I was facing the same flickering issue in tilda too. By flickering, I mean that suppose I open a frest terminal in that & then I press BACKSPACE, I get a flicker in screen window.
I have tried opening screen in gnome-terminal too, same problem.
I really want to use screen as complete replacement to tabs, but this flickering issue is holding me back. Any solution?