Finally updated my tmux to fix everything that broke in v2.9

.tmux.conf

# curl -L https://gist.github.com/srhopkins/f1cbe2932750fb383884919f9e53f23c/raw/

# Setting the prefix from C-b to C-a
# START:prefix
set -g prefix C-a  
# END:prefix
# Free the original Ctrl-b prefix keybinding
# START:unbind
unbind C-b 
# END:unbind
#setting the delay between prefix and command
# START:delay
set -s escape-time 1
# END:delay
# Ensure that we can send Ctrl-A to other apps
# START:bind_prefix
bind C-a send-prefix
# END:bind_prefix

# Set the base index for windows to 1 instead of 0
# START:index
set -g base-index 1
# END:index

# Set the base index for panes to 1 instead of 0
# START:panes_index
setw -g pane-base-index 1
# END:panes_index

# Reload the file with Prefix r
# START:reload
bind r source-file ~/.tmux.conf \; display "Reloaded!"
# END:reload

# splitting panes
# START:panesplit
bind | split-window -h
bind - split-window -v
# END:panesplit

# moving between panes
# START:paneselect
bind h select-pane -L 
bind j select-pane -D 
bind k select-pane -U
bind l select-pane -R    
# END:paneselect

bind -r < swap-window -d -t -1
bind -r > swap-window -d -t +1

# Quick pane selection
# START:panetoggle
bind -r C-h select-window -t :-
bind -r C-l select-window -t :+
# END:panetoggle

# Pane resizing
# START:paneresize
bind -r H resize-pane -L 5 
bind -r J resize-pane -D 5 
bind -r K resize-pane -U 5 
bind -r L resize-pane -R 5
# END:paneresize
# mouse support - set to on if you want to use the mouse
# START:mouse
set -g mouse off

# Set the default terminal mode to 256color mode
# START:termcolor
set -g default-terminal "screen-256color"
# END:termcolor

# enable activity alerts
#START:activity
setw -g monitor-activity on
set -g visual-activity on
#END:activity

# set the status line's colors
# START:statuscolor

set -g status-style fg=white,bg=black
# END:statuscolor

# set the color of the window list
# START:windowstatuscolor
setw -g window-status-style fg=cyan,bg=default,dim
# END:windowstatuscolor

# set colors for the active window
# START:activewindowstatuscolor
set -g window-status-current-style bg=red,fg=white,bright
# END:activewindowstatuscolor

# pane colors
# START:panecolors
set -g pane-active-border-style bg=yellow,fg=white
set -g pane-border-style fg=green,bg=black
# END:panecolors

# Command / message line
# START:cmdlinecolors
set -g message-style fg=white,bg=black
set -g message-style bright
# END:cmdlinecolors

# Status line top
set-option -g status-position top

# Status line left side
# START:statusleft
set -g status-left-length 40 
set -g status-left "#[fg=green]Session: #S #[fg=yellow]#I #[fg=cyan]#P"
# END:statusleft

# Status line right side
# 15% | 28 Nov 18:15
# START: statusright
set -g status-right "#[fg=cyan]%d %b %R"
# END:statusright

# Update the status bar every sixty seconds
# START:updateinterval
set -g status-interval 60
# END:updateinterval

# Center the window list
# START:centerwindowlist
set -g status-justify centre
# END:centerwindowlist

# enable vi keys.
# START:vikeys
setw -g mode-keys vi
# END:vikeys