This is very strange, could you describe he problem more? Also, does the contents of an ncurses app (vim, less, emacs) stay after you close the program?
When I use less in a tmux or screen session to view /var/log/syslog et al, when I type -S to chop long lines it continues to wrap the line instead of chop it.
No the screen is cleared after quitting.
I have TERM set to xterm-256colors FWIW.
Odd, I'm doing that daily at work without any issue. (tmux 1.8.x, putty, screen-256colors I believe)
What does "tput cols" say in and out screen/tmux? It's possible less doesn't know the proper width of the terminal.
80 cols, which is correct. Less seems to be fine when not in a tmux session.