No 'network' between devices on wireless network (Internet is ok)

Yesterday I bought a new router (Linksys WRT300N) which was a replacement from a dodgy Belkin-N router which kind of died. After setting up the wireless network, I get Internet OK on all my devices, but there is no networking between the devices (i.e. the Macbook Pro can't see the other map, or the apple TV). I'm sure there is a very simple explanation/setting, but I'm really struggling to find it!!
I'm connected to the Internet via a cable modem (through Virgin Media - was Telewest) which feeds the router. (DHCP enabled)
I've got the following devices set up on the wireless network:
MacBook Pro, iBook, PS3, 360, a PC and an Apple TV.
Because I can't see the other devices (e.g. mac's can't see each others sharing) I can't see the AppleTV to sync it anymore.
I'm at a loss at what else to try (I'm pretty experienced at IT, although not the dark arts of networks).
I have filesharing on, the 5353 UDP port open (iTunes works ok), firewall off on the router, all the IP addresses of the devices appear to be on the same Subnet. It all worked fine on the old router :-/
Any ideas very much welcome... I've read a lot of the Apple guides and nothing seems to point out something I haven't tried. The appletv DID appear in the device list earlier, but I'm not sure why/how and it went again. The Apple TV is on the wireless network fine, connects to U-Tube etc.

FIXED... there was an option, hidden away in the default advanced wireless settings that blocked communications between computers on the network... argh... defaulted to ON (Setting is called AP Isolation and allows communication with router but not each other...)
Phew...

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