This is my exact process:

1. Boot into Linux Ubuntu 13.10 from a USB Drive (Trial mode)
2. Insert a second USB drive with bitcoin-0.8.6-linux.tar
3. Extract the files to the desktop
4. Run the Bitcoin Qt
5. Export the public addresses to a .csv file and onto the USB drive
6. Navigate to ~/.bitcoin/ subdirectory and copy the wallet.dat file to the 2nd USB drive
(7. I would install Truecrypt and create a secure vault at this point but the process isn't working so I've cut this step for now)
7. Reboot into Mac OSX 10.9.1
8. Insert the USB drive and copy the public address from the .csv file
9. Open Bitcoin Qt and send a small amount of Bitcoin to the public offline wallet address
10. Wait for one confirmation by searching the public address on Blockchain.info
11. Close the Qt client, navigate to the Bitcoin directory in Application Support/Bitcoin
12. Copy the offline wallet.dat file created in Linux into the Bitcoin directory, in the process replacing the existing file.
13. Reboot the Bitcoin Qt, allow the network to sync (seems to happen pretty quickly)
14. Voila! Nothing.

I hold alt coins also and so I've been trying to establish a universal technique for offline storage that doesn't depend on offline paper wallets, Armoury, Electrum etc.