can't use the ''TAB'' map

i can't use any maps... i press tab, then nothing; it really sucks, makes me loose an incredible amount of time. Help please

Maybe check the keybindings in the Options and make sure it's still bound to tab?

Cheked and it still isbounded to tab, i cheked for other settings too, stuff like map transparency. when i press tab, map apprears for a quarter second and then goes away, i can still see character ''crosses'', just cant have the map to stay?

Can't you help me?