Cabin Configuration error- failure to save configuration to some aircraft.

R1, Atlas Air, 5Y, EWR 

I am having issues saving cabin configurations to certain airframes. I can create the configuration I would like, submit to save but when I am returned to my cabin configuration page, the new configuration I just made is not there. 

I believe this is airframe specific. I cannot make configurations for the DC7, Boeing 377 or the Lockheed L-188C. 

But have made configurations for the Boeing 707-120 and the Bristol Britannia. 

Any help would be great!