Yosemite & new iMac not seen using 5Gz wireless

I have a new iMac and an older macbook pro plus a number of other devices on my home network.
All my devices connect using 2.4GHz wireless except my iMac which uses 5 GHz wireless. Everything was working fine up until I upgraded to Yosemite OS X. Now all my devices on the 2.4 GHz wireless can see each other fine. But they can't see my iMac and my iMac can't see them. The error is "no route to host". The firewall on the iMac is off so it should work.
So it seems related to the fact that my iMac is on the different wireless frequency, as all the other devices are fine. I upgraded both my macbook and iMac to Yosemite so it is not Yosemite purely at fault. There seems to be a problem routing from my iMac to the other devices on the BT Hub.
I think it is a BT Hub 5, it's certainly very recent.
Any help?

Hi,
Thanks for the quick reply. It didn't work however. I reset the hub, and my devices so they all reset all their connection information.
To be clear,
I have the iMac - with newly installed OS X Yosemite, it connects to the hub fine and has internet connection fine through the hub. It is connected on 5 GHz wireless.
I have a macbook pro - with newly installed OS X Yosemite, it connects to the hub fine and has internet connection. It connects at 2.4 GHz wireless.
I have a bunch of other devices on the network that connect at 2.4 GHz wireless.
If I ping a device from my macbook it gets a reply and can see them fine. If I ping my iMac it times out, i.e. it can't see the iMac.
Likewise I can't ping any devices from my iMac.
This is a bit of a problem as I use my iMac as a home server for music and films.
It used to work fine when both my iMac and MBP were on Mavericks. It only started happening when I upgraded to Yosemite. Though Yosemite works fine on my MBP.

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