AirPort Express not seen by wifi devices, but router wired devices OK

Hi,
I purchased an AirPort Express yesterday, upgraded the firmware to 7.6.1, connected to my Netgear DG834G router as a wireless client ("Join an existing network"), plugged into stereo and iTunes on my MacPro had no problems using AirPlay.
Today I tried using the AirPort Utility on my iPad and my wife's MacBook (as well as iTunes), but neither of them can see the AX via WiFi. But my MacPro is wired into the router and can see it OK. Likewise if I connect the MacBook to the router it can see the AX fine.
On a more technical note the wired devices can ping the AX, but WiFi devices can't. I find that pretty strange as they're all on the same subnet.
I've tried several resets and reconfigs (even from the MacBook), but once the AX is set to talk to the router then the WiFi devices can't see it. And throughout all this the (wired) MacPro can use AirPlay with no problems.
Has anyone got any ideas on what's going on, I'm a bit stumped! Thanks in advance.
Cheers,
Jay

Problem solved. For some stupid reason I had switched on a setting on the Netgear called "Wireless Isolation", and you can probably guess what that does...
So it's all working now!

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