right click on ur esf shortcut and in the target field it should be C:\wherever hl is\hl.exe -console -game esforces
if uve done that already then open up ur config.cfg in ur esforces directory. there should be a line that says bind "`" "toggleconsole". if there isnt then add it. if there is and it still doesnt work then change it to bind "f10" "toggleconsole" or whatever key u want. if it still doesnt work then i dunno what to do =X.
hope i helped