Lose syntax highlightining
After issue :ScreenShell in vim the new vim buffer containing the file are without syntax highligtning. The screen shell pane have colors.
If you open vim in a new gnu screen session without using screen.vim, do you get syntax highlighting? You might need to set your term to screen-256color and/or install that termcap info. You can google around for additional information on setting that up (this should be unrelated to screen.vim).
I'm curious: I just noticed myself that when I open vim inside a tmux opened from :ScreenShell, then the colors are wrong.
I can reproduce this with simply: urxvt -e sh -c 'tmux -2'. The colors in tmux are good (I use solarized dark colorscheme). However, the colors in vim inside this tmux session are not good.
As I can reproduce this outside of the plugin, I realize this is not really an issue with this plugin, but I was thinking that you might have had the same problem yourself, and that you might know a solution?