Nameserver section within the reseller module is blank with just a spinner

I've been attempting to make the reseller work for me, this time I am finding that the nameserver section within the reseller module is totally blank except for a spinner, I have given it time and nothing ever happens. Other tabs show things as expected, except this one. Bug or bad config on my part?

I have 2 servers with CWP Pro.

In one of them the resellers section works perfect (all tabs including nameservers)
IN the other server happens the same.. all tabs ok except the nameserver tab.. only appears the spinning and nothing happens.

I compared both servers/configurations and all are identical..

IN the console appears this error :

Code: [Select]

Uncaught TypeError: nsdata is null
    renderNS https://hostname.com:2083/cwp_02d5826303ededa2/ideasau/?module=reseller:5774
    callback https://hostname.com:2083/cwp_02d5826303ededa2/ideasau/?module=reseller:5762
    complete https://hostname.com:2083/cwp_02d5826303ededa2/ideasau/?module=reseller:7973
    jQuery 4
Any help ?

Thanks
Fabian