Just in case, reboot. It often help under MacOsX. you should have after :
$ ps aux | grep fb root 99059 0,0 0,0 2477544 540 ?? S 11:43 0:00.00 /Library/Frameworks/Firebird.framework/Resources/bin/fbguard -daemon -forever root 99060 0,0 0,0 2485856 5088 ?? S 11:43 0:00.02 /Library/Frameworks/Firebird.framework/Resources/English.lproj/var/bin/fbserver and you can put in your path : /Library/Frameworks/Firebird.framework/Resources/bin/ and then a : gsec -user sysdba -password masterkey should be enough
