I closed a wallet in the 0.5.x version of Multibit for Mac. Now I can't seem to open it. When I use Open Wallet in File the file name comes up, as does my home library, but I can't figure out where it is stored. Thank you for your help.
On a Mac the wallets are stored by default in the user data area:
/Users/"user name"/Library/Application Data/MultiBit
The default wallet file name is "multibit.wallet".
On Mac OSx 10.9.1 (Mavericks)
Remeber to replace "username" with your own.