your problem is the default access you set up!
if you use flag Z, they don't have access to the admin commands
as flag Z means "User, no Admin"
a simple fix for you would be to change the access level in the
adminvote.sma
look for
Code:
register_concmd("amx_votemap","cmdVoteMap",ADMIN_VOTE,"<map> [map] [map] [map]")
and change to
Code:
register_concmd("amx_votemap","cmdVoteMap",ADMIN_USER,"<map> [map] [map] [map]")
that will allow all players to use amx_votemap from console and you don't have to give the access rights to them by deafult,
as depending on your other plugins, they might have access to other
functions as well,if you give all players those access rights!
hope that helped you!