[St00ne]

@summer.wind: If you use mp_timelimit 0, you might have at least one of the values below above 0:
mp_maxrounds, mp_winlimit or mp_fraglimit.
Otherwise you'll never change your map and don't need a mapvote.

Please tell us what values are set for mp_maxrounds, mp_winlimit and mp_fraglimit on your server so you can get help.