I ran into the "Play Button Crash".
When I press the Play button, I saw my cafe for 1 sec, then it bounced back to iOS.
(I am using iPod touch)
After a series of trial, I successfully recover from it.
Here are the steps I have taken.
1. Check whether your problem is same as mine: Try logout facebook before pressing "Play Button". If the game still crash, sorry, I cant help you.
2. If you are able to play without logged in facebook, its good news. Go to the map, press "Invite Friends" and login facebook as requested.
3. After you have logged in, and posted the invitation, *NEVER* get back to your own cafe yet. Go to your friends cafe, and deliver your food.
4. After that, press the home button (Yes, the physical home button on your iPod / iPhone)
5. Switch off Wifi / 3G (Just make sure you are not connected).
6. Get back to Zombie Cafe, Get back to your own cafe. Here you go~
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7. If it still crash, dont worry. There are still a few things you can do. "Kill" Zombie Cafe. (I mean Kill the process, not uninstall, not delete data)
8. Enable Wifi / 3G (Just make sure you are connected). Login facebook in "Option". Uncheck all your "Green" friends.
9. "Quit" Zombie Cafe (Dont Kill it), and disable Wifi / 3G. "Start" Zombie Cafe and Click "Play"
10. Go to "Map", you should be able to see your friends cafe, yet you cant enter them. "Quit" Zombie Cafe, and enable Wifi / 3G.
11. "Start" Zombie Cafe again. You can go back to your own cafe. A lot of food order will pop up (even if you got only a few friends). Press "OK"
12. The problem should be gone.
After your cafe REVIVED, "Kill" Zombie Cafe and start the apps again. Though not necessary, it just makes me a bit more comfortable.