I just got CarnivorePE (2.2.3). I'm running it on a MacBook Pro OS X 10.6.4. I did the chmod thing. Then I:
 
1. Ran the CarnivorePE program
2. Loaded up the Max/MSP client
3. Clicked Connect in the client.
 
Carnivore now shows "Client On" but "Network" has an empty circle next to it. If I load up the log file that came with Carnivore and play that back then it happily sends the packets out and the Max/MSP patch receives them. But I simply cannot get it to work live.
 
At first I thought it was because my Mac is connected to the router by an Ethernet cable through a switch. So I unplugged the cable and turned on Airport to use the router directly via wireless. Still nothing shows up.
 
Here's the OS X Console log after starting CarnivorePE:
05/07/2010 12:19:35      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Preferences] loading preference file
05/07/2010 12:19:35      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.GUI] creating and showing GUI
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [GUI] isFinishedLaunching = true;
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.Console] hide
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.CarnivorePE] starting carnivore core
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Core] starting Carnivore core...
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.net.Devices] Found network devices: {vmnet1=vmnet1, vmnet8=vmnet8, en1=AirPort}
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Core] Warning -- can't open device "vmnet1" (CaptureDeviceOpenException)
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Core] starting PacketCacheThread
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Core] addCarnivoreListener: org.rsg.carnivore.CarnivorePE@1ad6b4b
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.GUI] initializing GUI with preferences
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.AGJCheckBox] checkbox_ascii: true
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.AGJCheckBox] shouldAllowExternalClients: true
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.Menu] MENU_SHOW_CONSOLE
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.Console] show
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.AGJSlider] stateChanged: 11.0
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.gui.AGJSlider] stateChanged: 11.0
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.Log] setDebug: true
05/07/2010 12:19:37      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.net.Server] ServerSocket started on port 6667
 
Then, when I click connect in the Max/MSP patch, Carnivore switches to show "Client ON" and the OS X log shows:
 
05/07/2010 12:21:13      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.net.Server] new connection accepted from: 127.0.0.1
05/07/2010 12:21:13      [0x0-0x862862].CarnivorePE[16448]      [org.rsg.carnivore.net.Client] thread run()
 
Notes, the CarnivorePE Console has remained empty all this time.  
 
If I try some web activity in the browser, still nothing. I used Firefox to open an internet radio station and still nothing.
 
Any ideas?

Thanks for that. Yes, I sudo killed the VM processes and it all works fine now. Many thanks. :-)