I recently rebuilt my system and everything works except I can't scroll my (iterm2) terminal window back to look at commands and output that have scrolled off the screen.
Without tmux I can scroll but with tmux I can't
When using vim this isn't an issue as I can scroll back within vim.
For basic terminal (which I don't normally use) the behavior is a little different in that the current line scrolls back to show previous commands, but just that line, not the whole window.
I do use tmux and I have a detailed .tmux.conf However I have removed these settings, applied with
tmux source-file ~/.tmux.conf,. seen the changes applied (back to default tmux setting) and still have the issue
My settings include
set -g mouse on