I've changed it to MOUSE5 and a lot of other keys. They just don't do anything. I made sure to add whatever key to the cleanup.cfg just in case. I can't figure out what could be causing this problem. Here's my other config info.
In autoexec.cfg:
//AUTOEXEC
bind "x" "dropitems; discard"
//MEDIC - ENGIE ME!
alias medeng1 "saveme; alias medengshout medeng2"
alias medeng2 "engyme; alias medengshout medeng1"
alias medengshout medeng1
bind "m" "medengshout"
bind "e" "primeone"
bind "r" "primetwo"
bind "MOUSE2" "throwgren"
bind "ALT" "+attack2"
in cleanup.cfg:
unbind MOUSE4
unbind MOUSE5
unbind UPARROW
unbind LEFTARROW
unbind RIGHTARROW
unbind DOWNARROW
unbind f
unbind g
unbind ALT
unbind KP_PGDN
unbind KP_END