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If it doesn't currently work with both the master checkbox and the individual game's checkbox both on then you're waiting for the game devs or valve to make an update that fixes it, assuming they know about it.
Does the steam overlay work for you on other games?

There is the second master-checkbox on the IN-GAME tab on the settings window.
Steam main window > View>Settings>IN-GAME
[x] Enable Steam Community In-Game
Even if you have this AND the individual game checkmarked there is a small chance it wouldn't work due to how the game is designed. It may capture all the keyboard input before even letting steam see it. Sometimes a steam update fixes it.

Are you sure that message isn't coming from the monitor itself?
The game may be trying to send a very large image to a very small screen. Perhaps you accidently put the game into widescreen mode?
Anyway thats a general answer. I have no experience specifically with planetside 2. Check their official steam group and/or their website.

Florida already had its first highly publicized face-eater zombie. Two guys on the side of a highway woke up next to eachother, naked. And one guy begins eating the other's face. A police officer had to shoot him off the other guy since he only growled and continued eating.

The zombie apocalypse has already arrived, but in very small doses.

The Sun not good enough for ya?

Socrates?
Oh he's in the phone book under so--crates
-Bill & Ted's Excellent Adventure

I pity your table. What did it ever do you to?

I remove the almonds from the Almond Joys and put them in the mounds. Then I eat them both anyway because thats how I roll.

But....
I LOVE THEIR GODAWFUL ISSUES!

Mac system requirements:(I assume this is you, with your apple logo steam profile icon)
Minimum: OS X version Leopard 10.5.8, Snow Leopard 10.6.3, 1GB RAM, NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher Mouse, Keyboard, Internet Connection

Strange there isn't a Recommended section for mac...

If you have all that and it still doesn't work then something is wrong with your comp. I don't know enough about modern Macs (Feel free to ask me anything about the good ol' days of the System7 era).