How do you import private keys from 3.0 wallet into the new 4.0 wallet? I don't see an option to do so in the 4.0 wallet on the Mac.
First check the command line options
-upgradewallet
Upgrade wallet to latest format on startup
-salvagewallet
Attempt to recover private keys from a corrupt wallet on startup
these are used on a command line to modify how the qt file launches.
on the debug console
importprivkey "navcoinprivkey" ( "label" rescan )
so
importprivkey "blablablaba" ( "from Polo" rescan )
rescan reads the blockchain to restore old tx that sent to the pub key of this pri key