Chromecast and hub one

[#1]

Unable to setup my Chromecast (version 1) with my Hub One router.  Worked fine with previous BB suppler.  Chromecast help suggests AP isolation with dual band routers may be the cause but I can't find a setting on the router. 
Has any one got this working?
Thanks Kieran

[#2]

you need to change the ssid of the 5ghz.
you can find it in advance settings > wireless > 5ghz wireless

[#3]

Thanks, can you clarify as to what I change the SSID to?

[#4]

anything you want really - i just stuck a 5 on the end of mine.

[#5]

Router won't allow SSID change on 5GHz only on 2.4 unless I disable Sync with 2.4 GHz. 

[#6]

I set up the wifi on mine allowing same settings on both.
I then unticked the 'sync' box and added a '5' to the end of the 5GHz.

[#7]

Did you then leave it unticked?

[#8]

Yes.

[#9]

No luck with the desktop, I got it going using my tablet!
Thanks for the help.
Kieran